Flags specified for LPFNIG_ISIS_AREA, set with the IG_ISIS_area_dialog_CB_register function.

Values:

IG_ISIS_AREA_INIT	Used when the preview window is created.
IG_ISIS_AREA_DONE	Used when the preview window is destroyed.
IG_ISIS_AREA_GET	Called during dialog initialization to request values from the callback describing the image that will be painted.
IG_ISIS_AREA_SET	Unused.
IG_ISIS_AREA_PAINT	The callback should scale and paint its image into the supplied destRect using the supplied clipping rectangle (clipRect) and device context (hDC).