gefSizeFrame - (0)
This is the standard frame style that CimView/CimEdit has when started up. The frame is resizable with a resize handle or any edge of the frame,

gefDialogFrame - (1)
This frame style is a very thin border. The title bar does not have minimize or maximize buttons. It also does not have a resize handle, and the edges cannot be grabbed for resizing. It does however have a system menu in the left corner of the titlebar.

gefNoFrame - (2)
This frame style has no border and no title bar. It has no areas to resize or move the window.