Format: ControlBackdrop FrameName,
Example: ControlBackdrop "ButtonBackdropTemplate",
Purpose: Mimic Position and Size of the parent Frame. It is the texture displayed when the parent-Frame is enabled Is the name of the frame beeing used, The is also most times declared right below the control line. Most advanced Frame have such a thing or a custom named version of it.
Used in: MENU, POPUPMENU, BUTTON, GLUEBUTTON, TEXTBUTTON, GLUETEXTBUTTON, SCROLLBAR, SLIDER, CONTROL, TEXTAREA, EDITBOX, GLUEEDITBOX, GLUECHECKBOX, CHECKBOX