sub Show {

    croak 'DialogBox: "Show" method requires at least 1 argument'
	if scalar @_ < 1;
    my $cw = shift;
    my ($grab) = @_;
    my $old_focus = $cw->focusSave;
    my $old_grab = $cw->grabSave;

    shift if defined $grab && length $grab && ($grab =~ /global/);
    $cw->Popup(@_);

    Tk::catch {
    if (defined $grab && length $grab && ($grab =~ /global/)) {
	$cw->grabGlobal;
    } else {
	$cw->grab;
    }
    };
    if (my $focusw = $cw->cget(-focus)) {
	$focusw->focus;
    } elsif (defined $cw->{'default_button'}) {
	$cw->{'default_button'}->focus;
    } else {
	$cw->focus;
    }
    $cw->Wait;
    &$old_focus;
    &$old_grab;
    return $cw->{'selected_button'};
}

##</code><code>##

 
sub Popup
{
 my $w = shift;
 $w->configure(@_) if @_;
 $w->idletasks;
 my ($mw,$mh) = ($w->reqwidth,$w->reqheight);
 my ($rx,$ry,$rw,$rh) = (0,0,0,0);
 my $base    = $w->cget('-popover');
 my $outside = 0;
 if (defined $base)
  {
   if ($base eq 'cursor')
    {
     ($rx,$ry) = $w->pointerxy;
    }
   else
    {
     $rx = $base->rootx;
     $ry = $base->rooty;
     $rw = $base->Width;
     $rh = $base->Height;
    }
  }
 else
  {
   my $sc = ($w->parent) ? $w->parent->toplevel : $w;
   $rx = -$sc->vrootx;
   $ry = -$sc->vrooty;
   $rw = $w->screenwidth;
   $rh = $w->screenheight;
  }
 my ($X,$Y) = AnchorAdjust($w->cget('-overanchor'),$rx,$ry,$rw,$rh);
 ($X,$Y)    = AnchorAdjust($w->cget('-popanchor'),$X,$Y,-$mw,-$mh);
 # adjust to not cross screen borders
 if ($X < 0) { $X = 0 }
 if ($Y < 0) { $Y = 0 }
 if ($mw > $w->screenwidth)  { $X = 0 }
 if ($mh > $w->screenheight) { $Y = 0 }
 $w->Post($X,$Y);
 $w->waitVisibility;
}





sub Post
{
 my ($w,$X,$Y) = @_;
 $X = int($X);
 $Y = int($Y);
 $w->positionfrom('user');
 $w->geometry("+$X+$Y");
 # $w->MoveToplevelWindow($X,$Y);
 $w->deiconify;
 $w->raise;
}