Dear Photon experts,

Can anyone of you answer an easy question?

How do you put a check mark in a PtOnOffButton??

Yes I've read the help file, and still stumped. 
What is the resource name to set?
I have a simple dialoig with an OnOffButton.
Have tried all of following, but the #$%^&!  checkbox does not react.

 PtSetResource( ABW_ckbox, Pt_ARG_FLAGS, Pt_SET, 1 ); 
 PtSetResource( ABW_ckbox, Pt_ARG_FLAGS, Pt_SET, 0 ); 
 
long *px;
PtGetResource(  ABW_ckbox, Pt_ARG_FLAGS, &px, 1 ); // success
 PtSetResource( ABW_ckbox, Pt_ARG_FLAGS, *px | Pt_SET, 0 ); 
 PtSetResource( ABW_ckbox, Pt_ARG_FLAGS, *px | Pt_SET, 1 );
 
Thanks for any idea,
-- S.