gistfile1.m

-(id)init{
    UIMenuItem *customMenuItem = [[[UIMenuItem alloc] initWithTitle:@"Search" action:@selector(searchWord:)] autorelease];
    [[UIMenuController sharedMenuController] setMenuItems:[NSArray arrayWithObjects:customMenuItem, nil]];
    return [super init];
}
- (BOOL)canPerformAction:(SEL)action withSender:(id)sender {
    if (tweetContentView.superview != nil) {
        if (action == @selector(searchWord:)) {
            return YES;
        }
    }
	
    return [super canPerformAction:action withSender:sender];
}
-(void)searchWord:(id)sender{
    //do things here
}