rem: bPtr->flags.pullsDown = flag;
add: bPtr->flags.pullsDown = ((flag==0) ? 0 : 1);
context: WMSetPopUpButtonPullsDown(WMPopUpButton *bPtr, Bool flag){    bPtr->flags.pullsDown = flag;    if (flag) {	bPtr->selectedItemIndex = -1;    }    if (bPtr->view->flags.mapped)	paintPopUpButton(bPtr);}