PushButton

Motif PushButtons appear all over Sun MTPScan's screens. In all cases, a 3D 
appearance distinguishes a PushButton from a KxLabel. A PushButton looks like 
it is slightly sticking out of the display. When clicked with the first mouse 
button, the PushButton inverts its color and sinks into the screen. When the 
button is released, the action associated with the PushButton activates and the
PushButton resumes its original bubbled 3D appearance. The "labelString" 
resource of the PushButton identifies the action for that button. For example, 
the Done PushButton in most Dialogs always dismisses the Dialog.
