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