VisualElement Root VisualElement for the main view.
Returns a VisualElement for attaching child VisualElement onto the main view of a ISpriteEditor.
This method returns the root VisualElement for SpriteEditorModuleBase which uses the UIElement instead of IMGUI for its UI. A VisualElement that is added to this container has the same draw order as SpriteEditorModuleBase.DoPostGUI.