XmNapplyCallback
This callback is used to inform the application of the activation of the apply button
The return structure is:
typdef struct {
int num_colr;
Pgcolr colr;
} XmGColorWsCallbackStruct
This callback is also call when using valuator with continue mode.
With this structure, application can set color (with pset_colr_rep for example)
XmNundoCallback
This callback is used to inform the application of the activation of the undo button
XmNcloseCallback
This callback is used to inform the application of the activation of the close button