The following code segment gets the button's ID, assigns a callback, and manages the button. It assumes that quickHelpDialog was just created.
Widget moreButton; moreButton = DtHelpQuickDialogGetChild (quickHelpDialog, DtHELP_QUICK_MORE_BUTTON); XtAddCallback (moreButton, XmNactivateCallback, MoreHelpCB, NULL); XtManageChild (moreButton);
DtHelpDialog(3) man page
DtHelpQuickDialog(3) man page