Buttons and Toggles

GtkButton — A widget that creates a signal when clicked on
GtkCheckButton
GtkRadioButton — A choice from multiple check buttons
GtkToggleButton
GtkLinkButton — Create buttons bound to a URL
GtkScaleButton — A button which pops up a scale
GtkVolumeButton — A button which pops up a volume control
GtkSwitch — A "light switch" style toggle