# Containers

All visible interface elements must ultimately belong to a gDialog.

gDialog | The mandatory top-level container for any and all application windows.
gHbox , gVbox | (For obvious reasons no screenshot is provided) An otherwise invisible container for composing elements horizontally/ vertically.
gFrame | A container/groupbox with a visible outline frame and title.
gSplit | A gH/Vbox with a movable resizer between two other children.
gTabs | A tabbed control, also sometimes known as a notebook.