_ToggleMenuItem
fShowCaption = _ToggleMenuItem(message->what);
fImageView->SetScaleBilinear(_ToggleMenuItem(message->what));
fShowToolBar = _ToggleMenuItem(message->what);
bool selectionMode = _ToggleMenuItem(MSG_SELECTION_MODE);
_ToggleMenuItem(kMsgStretchToWindow));
bool _ToggleMenuItem(uint32 what);