The GraphicalUiElement is the base class for all Gum runtime objects. In other words, all Gum components, screens, and standard elements inherit from this class when running in a FlatRedBall project.
The GraphicalUiElement class provides functionality for positioning, parenting, sizing, and layout logic.
Every Screen and Component in a Gum project will create a class in your Visual Studio project that inherits from GraphicalUiElement.
GraphicalUiElement as IWindow
All GraphicalUiElement instances implement the IWindow interface, which means that they can be used just like other FlatRedBall UI elements. For example, all GraphicalUiElements have a Click event which can be subscribed to.
For more information on the IWindow interface, see the IWindow page.