diff --git a/source/gui/CButton.cpp b/source/gui/CButton.cpp
index 4cd372767a..2feab9f874 100644
--- a/source/gui/CButton.cpp
+++ b/source/gui/CButton.cpp
@@ -57,9 +57,6 @@ CButton::~CButton()
 
 void CButton::SetupText()
 {
-	if (!GetGUI())
-		return;
-
 	ENSURE(m_GeneratedTexts.size() == 1);
 
 	CStrW font;
diff --git a/source/gui/CChart.cpp b/source/gui/CChart.cpp
index 5e10f9f2e7..3a5760966e 100644
--- a/source/gui/CChart.cpp
+++ b/source/gui/CChart.cpp
@@ -116,9 +116,6 @@ void CChart::Draw()
 {
 	PROFILE3("render chart");
 
-	if (!GetGUI())
-		return;
-
 	if (m_Series.empty())
 		return;
 
@@ -210,9 +207,6 @@ void CChart::UpdateSeries()
 
 void CChart::SetupText()
 {
-	if (!GetGUI())
-		return;
-
 	for (SGUIText* t : m_GeneratedTexts)
 		delete t;
 	m_GeneratedTexts.clear();
diff --git a/source/gui/CCheckBox.cpp b/source/gui/CCheckBox.cpp
index cf87763f91..4262930311 100644
--- a/source/gui/CCheckBox.cpp
+++ b/source/gui/CCheckBox.cpp
@@ -66,9 +66,6 @@ CCheckBox::~CCheckBox()
 
 void CCheckBox::SetupText()
 {
-	if (!GetGUI())
-		return;
-
 	ENSURE(m_GeneratedTexts.size() == 1);
 
 	CStrW font;
diff --git a/source/gui/CDropDown.cpp b/source/gui/CDropDown.cpp
index 2142ff7269..5db6934ce8 100644
--- a/source/gui/CDropDown.cpp
+++ b/source/gui/CDropDown.cpp
@@ -103,7 +103,7 @@ void CDropDown::HandleMessage(SGUIMessage& Message)
 		if (!m_Open)
 			break;
 
-		CPos mouse = GetMousePos();
+		CPos mouse = m_pGUI->GetMousePos();
 
 		if (!GetListRect().PointInside(mouse))
 			break;
@@ -205,7 +205,7 @@ void CDropDown::HandleMessage(SGUIMessage& Message)
 		}
 		else
 		{
-			CPos mouse = GetMousePos();
+			const CPos& mouse = m_pGUI->GetMousePos();
 
 			// If the regular area is pressed, then abort, and close.
 			if (m_CachedActualSize.PointInside(mouse))
@@ -460,24 +460,18 @@ CRect CDropDown::GetListRect() const
 
 bool CDropDown::MouseOver()
 {
-	if(!GetGUI())
-		throw PSERROR_GUI_OperationNeedsGUIObject();
-
 	if (m_Open)
 	{
 		CRect rect(m_CachedActualSize.left, std::min(m_CachedActualSize.top, GetListRect().top),
 		           m_CachedActualSize.right, std::max(m_CachedActualSize.bottom, GetListRect().bottom));
-		return rect.PointInside(GetMousePos());
+		return rect.PointInside(m_pGUI->GetMousePos());
 	}
 	else
-		return m_CachedActualSize.PointInside(GetMousePos());
+		return m_CachedActualSize.PointInside(m_pGUI->GetMousePos());
 }
 
 void CDropDown::Draw()
 {
-	if (!GetGUI())
-		return;
-
 	float bz = GetBufferedZ();
 
 	float dropdown_size, button_width;
diff --git a/source/gui/CGUI.h b/source/gui/CGUI.h
index 8aa6f34a09..9997f0db21 100644
--- a/source/gui/CGUI.h
+++ b/source/gui/CGUI.h
@@ -72,8 +72,6 @@ class CGUI
 {
 	NONCOPYABLE(CGUI);
 
-	friend class IGUIObject;
-
 private:
 	// Private typedefs
 	using ConstructObjectFunction = IGUIObject* (*)(CGUI*);
@@ -161,6 +159,11 @@ public:
 	 */
 	void LoadXmlFile(const VfsPath& Filename, boost::unordered_set<VfsPath>& Paths);
 
+	/**
+	 * Return the object which is an ancestor of every other GUI object.
+	 */
+	IGUIObject* GetBaseObject() const { return m_BaseObject; };
+
 	/**
 	 * Checks if object exists and return true or false accordingly
 	 *
@@ -169,7 +172,6 @@ public:
 	 */
 	bool ObjectExists(const CStr& Name) const;
 
-
 	/**
 	 * Returns the GUI object with the desired name, or NULL
 	 * if no match is found,
@@ -184,6 +186,16 @@ public:
 	 */
 	IGUIObject* FindObjectUnderMouse() const;
 
+	/**
+	 * Returns the current screen coordinates of the cursor.
+	 */
+	const CPos& GetMousePos() const { return m_MousePos; };
+
+	/**
+	 * Returns the currently pressed mouse buttons.
+	 */
+	const unsigned int& GetMouseButtons() { return m_MouseButtons; };
+
 	const SGUIScrollBarStyle* GetScrollBarStyle(const CStr& style) const;
 
 	/**
@@ -233,16 +245,25 @@ public:
 	 */
 	SGUIText GenerateText(const CGUIString& Text, const CStrW& Font, const float& Width, const float& BufferZone, const IGUIObject* pObject = NULL);
 
-
 	/**
 	 * Check if an icon exists
 	 */
-	bool IconExists(const CStr& str) const { return (m_Icons.count(str) != 0); }
+	bool HasIcon(const CStr& name) const { return (m_Icons.count(name) != 0); }
 
 	/**
 	 * Get Icon (a const reference, can never be changed)
 	 */
-	const SGUIIcon& GetIcon(const CStr& str) const { return m_Icons.find(str)->second; }
+	const SGUIIcon& GetIcon(const CStr& name) const { return m_Icons.at(name); }
+
+	/**
+	 * Check if a style exists
+	 */
+	bool HasStyle(const CStr& name) const { return (m_Styles.count(name) != 0); }
+
+	/**
+	 * Get Style if it exists, otherwise throws an exception.
+	 */
+	const SGUIStyle& GetStyle(const CStr& name) const { return m_Styles.at(name); }
 
 	/**
 	 * Get pre-defined color (if it exists)
@@ -253,8 +274,6 @@ public:
 	shared_ptr<ScriptInterface> GetScriptInterface() { return m_ScriptInterface; };
 	JS::Value GetGlobalObject() { return m_ScriptInterface->GetGlobalObject(); };
 
-private:
-
 	/**
 	 * Updates the object pointers, needs to be called each
 	 * time an object has been added or removed.
@@ -266,6 +285,7 @@ private:
 	 */
 	void UpdateObjects();
 
+private:
 	/**
 	 * Adds an object to the GUI's object database
 	 * Private, since you can only add objects through
@@ -286,12 +306,12 @@ private:
 	 */
 	IGUIObject* ConstructObject(const CStr& str);
 
+public:
 	/**
 	 * Get Focused Object.
 	 */
 	IGUIObject* GetFocusedObject() { return m_FocusedObject; }
 
-public:
 	/**
 	 * Change focus to new object.
 	 * Will send LOST_FOCUS/GOT_FOCUS messages as appropriate.
diff --git a/source/gui/CImage.cpp b/source/gui/CImage.cpp
index f3d87352b7..6cda4148e1 100644
--- a/source/gui/CImage.cpp
+++ b/source/gui/CImage.cpp
@@ -38,9 +38,6 @@ CImage::~CImage()
 
 void CImage::Draw()
 {
-	if (!GetGUI())
-		return;
-
 	float bz = GetBufferedZ();
 
 	CGUISpriteInstance* sprite;
diff --git a/source/gui/CInput.cpp b/source/gui/CInput.cpp
index 22768bcaff..adca7f712c 100644
--- a/source/gui/CInput.cpp
+++ b/source/gui/CInput.cpp
@@ -912,7 +912,7 @@ void CInput::HandleMessage(SGUIMessage& Message)
 		// Check if we're selecting the scrollbar
 		if (GetScrollBar(0).GetStyle() && multiline)
 		{
-			if (GetMousePos().x > m_CachedActualSize.right - GetScrollBar(0).GetStyle()->m_Width)
+			if (m_pGUI->GetMousePos().x > m_CachedActualSize.right - GetScrollBar(0).GetStyle()->m_Width)
 				break;
 		}
 
@@ -1178,9 +1178,6 @@ void CInput::Draw()
 	if (scrollbar && multiline)
 		IGUIScrollBarOwner::Draw();
 
-	if (!GetGUI())
-		return;
-
 	CStrW font_name_w;
 	CGUIColor color, color_selected;
 	GUI<CStrW>::GetSetting(this, "font", font_name_w);
@@ -1907,7 +1904,7 @@ int CInput::GetMouseHoveringTextPosition() const
 
 	std::list<SRow>::const_iterator current = m_CharacterPositions.begin();
 
-	CPos mouse = GetMousePos();
+	CPos mouse = m_pGUI->GetMousePos();
 
 	if (multiline)
 	{
diff --git a/source/gui/CList.cpp b/source/gui/CList.cpp
index 471bb19617..8658ca58a8 100644
--- a/source/gui/CList.cpp
+++ b/source/gui/CList.cpp
@@ -71,9 +71,6 @@ CList::~CList()
 
 void CList::SetupText()
 {
-	if (!GetGUI())
-		return;
-
 	m_Modified = true;
 	CGUIList* pList;
 	GUI<CGUIList>::GetSettingPointer(this, "list", pList);
@@ -538,8 +535,8 @@ int CList::GetHoveredItem()
 	if (scrollbar)
 		scroll = GetScrollBar(0).GetPos();
 
-	CRect rect = GetListRect();
-	CPos mouse = GetMousePos();
+	const CRect& rect = GetListRect();
+	CPos mouse = m_pGUI->GetMousePos();
 	mouse.y += scroll;
 
 	// Mouse is over scrollbar
diff --git a/source/gui/COList.cpp b/source/gui/COList.cpp
index 5109cafa6e..fd40d1e08f 100644
--- a/source/gui/COList.cpp
+++ b/source/gui/COList.cpp
@@ -41,9 +41,6 @@ COList::COList(CGUI* pGUI)
 
 void COList::SetupText()
 {
-	if (!GetGUI())
-		return;
-
 	CGUIList* pList;
 	GUI<CGUIList>::GetSettingPointer(this, "list", pList);
 
@@ -154,7 +151,7 @@ void COList::HandleMessage(SGUIMessage& Message)
 		if (!sortable)
 			return;
 
-		CPos mouse = GetMousePos();
+		const CPos& mouse = m_pGUI->GetMousePos();
 		if (!m_CachedActualSize.PointInside(mouse))
 			return;
 
@@ -321,9 +318,6 @@ void COList::DrawList(const int& selected, const CStr& _sprite, const CStr& _spr
 	if (scrollbar)
 		IGUIScrollBarOwner::Draw();
 
-	if (!GetGUI())
-		return;
-
 	CRect rect = GetListRect();
 
 	CGUISpriteInstance* sprite = NULL;
diff --git a/source/gui/CProgressBar.cpp b/source/gui/CProgressBar.cpp
index 0540294019..a638b1c08d 100644
--- a/source/gui/CProgressBar.cpp
+++ b/source/gui/CProgressBar.cpp
@@ -64,9 +64,6 @@ void CProgressBar::HandleMessage(SGUIMessage& Message)
 
 void CProgressBar::Draw()
 {
-	if (!GetGUI())
-		return;
-
 	float bz = GetBufferedZ();
 
 	CGUISpriteInstance* sprite_background;
diff --git a/source/gui/CSlider.cpp b/source/gui/CSlider.cpp
index ee292e3fe4..1d24a9bcc0 100644
--- a/source/gui/CSlider.cpp
+++ b/source/gui/CSlider.cpp
@@ -83,7 +83,7 @@ void CSlider::HandleMessage(SGUIMessage& Message)
 	}
 	case GUIM_MOUSE_PRESS_LEFT:
 	{
-		m_Mouse = GetMousePos();
+		m_Mouse = m_pGUI->GetMousePos();
 		m_IsPressed = true;
 
 		IncrementallyChangeValue((m_Mouse.x - GetButtonRect().CenterPoint().x) * GetSliderRatio());
@@ -100,8 +100,8 @@ void CSlider::HandleMessage(SGUIMessage& Message)
 			m_IsPressed = false;
 		if (m_IsPressed)
 		{
-			float difference = float(GetMousePos().x - m_Mouse.x) * GetSliderRatio();
-			m_Mouse = GetMousePos();
+			float difference = float(m_pGUI->GetMousePos().x - m_Mouse.x) * GetSliderRatio();
+			m_Mouse = m_pGUI->GetMousePos();
 			IncrementallyChangeValue(difference);
 		}
 		break;
@@ -113,9 +113,6 @@ void CSlider::HandleMessage(SGUIMessage& Message)
 
 void CSlider::Draw()
 {
-	if (!GetGUI())
-		return;
-
 	CGUISpriteInstance* sprite;
 	CGUISpriteInstance* sprite_button;
 	int cell_id;
diff --git a/source/gui/CText.cpp b/source/gui/CText.cpp
index e2e6d98b0e..f285e67b8f 100644
--- a/source/gui/CText.cpp
+++ b/source/gui/CText.cpp
@@ -198,9 +198,6 @@ void CText::Draw()
 		// Draw scrollbar
 		IGUIScrollBarOwner::Draw();
 
-	if (!GetGUI())
-		return;
-
 	CGUISpriteInstance* sprite;
 	int cell_id;
 	bool clip;
@@ -251,7 +248,7 @@ bool CText::MouseOverIcon()
 		for (const SGUIText::SSpriteCall& spritecall : guitext->m_SpriteCalls)
 		{
 			// Check mouse over sprite
-			if (!spritecall.m_Area.PointInside(GetMousePos() - m_CachedActualSize.TopLeft()))
+			if (!spritecall.m_Area.PointInside(m_pGUI->GetMousePos() - m_CachedActualSize.TopLeft()))
 				continue;
 
 			// If tooltip exists, set the property
diff --git a/source/gui/CTooltip.cpp b/source/gui/CTooltip.cpp
index f3ed6801c1..abc368806d 100644
--- a/source/gui/CTooltip.cpp
+++ b/source/gui/CTooltip.cpp
@@ -63,9 +63,6 @@ CTooltip::~CTooltip()
 
 void CTooltip::SetupText()
 {
-	if (!GetGUI())
-		return;
-
 	ENSURE(m_GeneratedTexts.size() == 1);
 
 	CStrW font;
@@ -92,7 +89,7 @@ void CTooltip::SetupText()
 
 	GUI<bool>::GetSetting(this, "independent", independent);
 	if (independent)
-		mousepos = GetMousePos();
+		mousepos = m_pGUI->GetMousePos();
 	else
 		GUI<CPos>::GetSetting(this, "_mousepos", mousepos);
 
@@ -151,9 +148,6 @@ void CTooltip::HandleMessage(SGUIMessage& Message)
 
 void CTooltip::Draw()
 {
-	if (!GetGUI())
-		return;
-
 	float z = 900.f; // TODO: Find a nicer way of putting the tooltip on top of everything else
 
 	CGUISpriteInstance* sprite;
diff --git a/source/gui/GUItext.cpp b/source/gui/GUItext.cpp
index 490421d859..aeba801ddf 100644
--- a/source/gui/GUItext.cpp
+++ b/source/gui/GUItext.cpp
@@ -97,7 +97,7 @@ void CGUIString::GenerateTextCall(const CGUI* pGUI, SFeedback& Feedback, CStrInt
 			       tag.m_TagType == TextChunk::Tag::TAG_ICON);
 
 			const std::string& path = utf8_from_wstring(tag.m_TagValue);
-			if (!pGUI->IconExists(path))
+			if (!pGUI->HasIcon(path))
 			{
 				if (pObject)
 					LOGERROR("Trying to use an icon, imgleft or imgright-tag with an undefined icon (\"%s\").", path.c_str());
diff --git a/source/gui/IGUIButtonBehavior.cpp b/source/gui/IGUIButtonBehavior.cpp
index eb8ded19b6..685a019de1 100644
--- a/source/gui/IGUIButtonBehavior.cpp
+++ b/source/gui/IGUIButtonBehavior.cpp
@@ -166,9 +166,6 @@ CGUIColor IGUIButtonBehavior::ChooseColor()
 
 void IGUIButtonBehavior::DrawButton(const CRect& rect, const float& z, CGUISpriteInstance& sprite, CGUISpriteInstance& sprite_over, CGUISpriteInstance& sprite_pressed, CGUISpriteInstance& sprite_disabled, int cell_id)
 {
-	if (!GetGUI())
-		return;
-
 	bool enabled;
 	GUI<bool>::GetSetting(this, "enabled", enabled);
 
diff --git a/source/gui/IGUIObject.cpp b/source/gui/IGUIObject.cpp
index f723a97e5c..08d0f7526c 100644
--- a/source/gui/IGUIObject.cpp
+++ b/source/gui/IGUIObject.cpp
@@ -70,11 +70,6 @@ void IGUIObject::AddChild(IGUIObject* pChild)
 
 	m_Children.push_back(pChild);
 
-	// If this (not the child) object is already attached
-	//  to a CGUI, it pGUI pointer will be non-null.
-	//  This will mean we'll have to check if we're using
-	//  names already used.
-	if (pChild->GetGUI())
 	{
 		try
 		{
@@ -135,10 +130,7 @@ void IGUIObject::AddSetting(const CStr& Name)
 
 bool IGUIObject::MouseOver()
 {
-	if (!GetGUI())
-		throw PSERROR_GUI_OperationNeedsGUIObject();
-
-	return m_CachedActualSize.PointInside(GetMousePos());
+	return m_CachedActualSize.PointInside(m_pGUI->GetMousePos());
 }
 
 bool IGUIObject::MouseOverIcon()
@@ -146,14 +138,6 @@ bool IGUIObject::MouseOverIcon()
 	return false;
 }
 
-CPos IGUIObject::GetMousePos() const
-{
-	if (GetGUI())
-		return GetGUI()->m_MousePos;
-
-	return CPos();
-}
-
 void IGUIObject::UpdateMouseOver(IGUIObject* const& pMouseOver)
 {
 	if (pMouseOver == this)
@@ -269,17 +253,12 @@ void IGUIObject::UpdateCachedSize()
 	}
 }
 
-void IGUIObject::LoadStyle(CGUI& GUIinstance, const CStr& StyleName)
+void IGUIObject::LoadStyle(CGUI& pGUI, const CStr& StyleName)
 {
-	// Fetch style
-	if (GUIinstance.m_Styles.count(StyleName) == 1)
-	{
-		LoadStyle(GUIinstance.m_Styles[StyleName]);
-	}
+	if (pGUI.HasStyle(StyleName))
+		LoadStyle(pGUI.GetStyle(StyleName));
 	else
-	{
 		debug_warn(L"IGUIObject::LoadStyle failed");
-	}
 }
 
 void IGUIObject::LoadStyle(const SGUIStyle& Style)
@@ -325,9 +304,6 @@ float IGUIObject::GetBufferedZ() const
 
 void IGUIObject::RegisterScriptHandler(const CStr& Action, const CStr& Code, CGUI* pGUI)
 {
-	if(!GetGUI())
-		throw PSERROR_GUI_OperationNeedsGUIObject();
-
 	JSContext* cx = pGUI->GetScriptInterface()->GetContext();
 	JSAutoRequest rq(cx);
 	JS::RootedValue globalVal(cx, pGUI->GetGlobalObject());
@@ -396,11 +372,13 @@ void IGUIObject::ScriptEvent(const CStr& Action)
 	// Set up the 'mouse' parameter
 	JS::RootedValue mouse(cx);
 
+	const CPos& mousePos = m_pGUI->GetMousePos();
+
 	m_pGUI->GetScriptInterface()->CreateObject(
 		&mouse,
-		"x", m_pGUI->m_MousePos.x,
-		"y", m_pGUI->m_MousePos.y,
-		"buttons", m_pGUI->m_MouseButtons);
+		"x", mousePos.x,
+		"y", mousePos.y,
+		"buttons", m_pGUI->GetMouseButtons());
 
 	JS::AutoValueVector paramData(cx);
 	paramData.append(mouse);
@@ -465,17 +443,17 @@ CStr IGUIObject::GetPresentableName() const
 
 void IGUIObject::SetFocus()
 {
-	GetGUI()->m_FocusedObject = this;
+	m_pGUI->SetFocusedObject(this);
 }
 
 bool IGUIObject::IsFocused() const
 {
-	return GetGUI()->m_FocusedObject == this;
+	return m_pGUI->GetFocusedObject() == this;
 }
 
 bool IGUIObject::IsRootObject() const
 {
-	return GetGUI() != 0 && m_pParent == GetGUI()->m_BaseObject;
+	return m_pParent == m_pGUI->GetBaseObject();
 }
 
 void IGUIObject::TraceMember(JSTracer* trc)
diff --git a/source/gui/IGUIObject.h b/source/gui/IGUIObject.h
index 33d22491b1..bdcaa13691 100644
--- a/source/gui/IGUIObject.h
+++ b/source/gui/IGUIObject.h
@@ -264,7 +264,7 @@ protected:
 	 * @param GUIinstance Reference to the GUI
 	 * @param StyleName Style by name
 	 */
-	void LoadStyle(CGUI& GUIinstance, const CStr& StyleName);
+	void LoadStyle(CGUI& pGUI, const CStr& StyleName);
 
 	/**
 	 * Loads a style.
@@ -319,11 +319,6 @@ protected:
 	 */
 	IGUIObject* GetParent() const;
 
-	/**
-	 * Get Mouse from CGUI.
-	 */
-	CPos GetMousePos() const;
-
 	/**
 	 * Handle additional children to the \<object\>-tag. In IGUIObject, this function does
 	 * nothing. In CList and CDropDown, it handles the \<item\>, used to build the data.
diff --git a/source/gui/IGUIScrollBar.cpp b/source/gui/IGUIScrollBar.cpp
index 88e021186a..9e6f3d1f75 100644
--- a/source/gui/IGUIScrollBar.cpp
+++ b/source/gui/IGUIScrollBar.cpp
@@ -96,7 +96,7 @@ void IGUIScrollBar::HandleMessage(SGUIMessage& Message)
 	{
 		// TODO Gee: Optimizations needed!
 
-		CPos mouse = m_pHostObject->GetMousePos();
+		const CPos& mouse = m_pGUI->GetMousePos();
 
 		// If bar is being dragged
 		if (m_BarPressed)
@@ -123,7 +123,7 @@ void IGUIScrollBar::HandleMessage(SGUIMessage& Message)
 		if (!m_pHostObject)
 			break;
 
-		CPos mouse = m_pHostObject->GetMousePos();
+		const CPos& mouse = m_pGUI->GetMousePos();
 
 		// if bar is pressed
 		if (GetBarRect().PointInside(mouse))
diff --git a/source/gui/IGUIScrollBarOwner.cpp b/source/gui/IGUIScrollBarOwner.cpp
index f83e4ba45f..1df2f4ff15 100644
--- a/source/gui/IGUIScrollBarOwner.cpp
+++ b/source/gui/IGUIScrollBarOwner.cpp
@@ -46,9 +46,6 @@ void IGUIScrollBarOwner::AddScrollBar(IGUIScrollBar* scrollbar)
 
 const SGUIScrollBarStyle* IGUIScrollBarOwner::GetScrollBarStyle(const CStr& style) const
 {
-	if (!GetGUI())
-		return NULL;
-
 	return GetGUI()->GetScrollBarStyle(style);
 }
 
diff --git a/source/gui/MiniMap.cpp b/source/gui/MiniMap.cpp
index ccf22ed09e..b80d47c094 100644
--- a/source/gui/MiniMap.cpp
+++ b/source/gui/MiniMap.cpp
@@ -192,7 +192,7 @@ void CMiniMap::HandleMessage(SGUIMessage& Message)
 bool CMiniMap::MouseOver()
 {
 	// Get the mouse position.
-	CPos mousePos = GetMousePos();
+	const CPos& mousePos = m_pGUI->GetMousePos();
 	// Get the position of the center of the minimap.
 	CPos minimapCenter = CPos(m_CachedActualSize.left + m_CachedActualSize.GetWidth() / 2.0, m_CachedActualSize.bottom - m_CachedActualSize.GetHeight() / 2.0);
 	// Take the magnitude of the difference of the mouse position and minimap center.
@@ -208,7 +208,7 @@ void CMiniMap::GetMouseWorldCoordinates(float& x, float& z)
 {
 	// Determine X and Z according to proportion of mouse position and minimap
 
-	CPos mousePos = GetMousePos();
+	const CPos& mousePos = m_pGUI->GetMousePos();
 
 	float px = (mousePos.x - m_CachedActualSize.left) / m_CachedActualSize.GetWidth();
 	float py = (m_CachedActualSize.bottom - mousePos.y) / m_CachedActualSize.GetHeight();