This inheritance list is sorted roughly, but not completely, alphabetically:

[detail level 12345]

tgui::EditBox::Alignment	The text alignment
tgui::Callback	When you receive an action callback from an object then this struct will be passed as parameter
Drawable
tgui::OBJECT	The parent struct for every object
tgui::AnimatedButton
tgui::AnimatedPicture	Load multiple images and add then behind each other to create a simple animation or even a movie
tgui::Button
tgui::ChatBox
tgui::Checkbox
tgui::RadioButton
tgui::ComboBox
tgui::EditBox
tgui::GroupObject
tgui::Grid
tgui::Panel	A static group of objects. The background color can be solid or transparent
tgui::ChildWindow	Movable Panel with title bar
tgui::Label
tgui::ListBox
tgui::LoadingBar
tgui::Picture
tgui::SpriteSheet	Load one big image and split it into smaller images so that you can display tiles or play an animation
tgui::Slider
tgui::Scrollbar
tgui::Slider2D
tgui::SpinButton
tgui::Tab
tgui::TextBox
tgui::Group	Parent struct for objects that store multiple objects
tgui::Form
tgui::GroupObject
tgui::Window
tgui::Grid::Layout	The layout of the object
NonCopyable
tgui::Form
tgui::TextureManager
tgui::OBJECT_ANIMATION	Parent object for all objects that need to access the internal clock of the window
tgui::AnimatedButton
tgui::AnimatedPicture	Load multiple images and add then behind each other to create a simple animation or even a movie
tgui::EditBox
tgui::TextBox
tgui::OBJECT_BORDERS	Parent struct for every object that has borders
tgui::ChatBox
tgui::ChildWindow	Movable Panel with title bar
tgui::ComboBox
tgui::EditBox
tgui::ListBox
tgui::TextBox
RenderWindow
tgui::Window
Transformable
tgui::OBJECT	The parent struct for every object
tgui::Vector4< T >