_EnableMenuItem
_EnableMenuItem(fBar, MSG_PAGE_FIRST,
_EnableMenuItem(fBar, MSG_PAGE_LAST, fNavigator.HasNextPage());
_EnableMenuItem(fBar, MSG_PAGE_NEXT, fNavigator.HasNextPage());
_EnableMenuItem(fBar, MSG_PAGE_PREV, fNavigator.HasPreviousPage());
_EnableMenuItem(fBar, MSG_FILE_NEXT, false);
_EnableMenuItem(fBar, MSG_FILE_PREV, false);
_EnableMenuItem(fBar, B_COPY, enable);
_EnableMenuItem(fBar, MSG_CLEAR_SELECT, enable);
void _EnableMenuItem(BMenu* menu, uint32 what,