Creating Virtual Controller in Cocos-2d

**ATTENTION**
I am currently not so sure if there is a better way to do, but I found this way handy and good for now.

I am currently creating an iPhone game using cocos-2d, iphone game library, and I wanted to create a overlay buttons. I found it's easy using 'Menu' of cocos-2d, because they have animation buttons and it's easy to adjust their positions, align and opacity.

Problem is, they don't have "Button Down" event. So I create a child class of MenuItem to catch their button-down-event by overriding selected/unselected methods.
Here is "VirtualButton.h".

#import 
#import "cocos2d.h"

@interface VirtualButton : MenuItemImage {
 id myTarget;
 SEL selectedCallback;
 BOOL pushed;
}
- (void) setOnClickCallback:(id)target selectedCallback:(SEL)selected_cb;
- (void) selected;
- (void) unselected;
@end

and here is "VirtualButton.m'.

#import "VirtualButton.h"

@implementation VirtualButton
- (void) setOnClickCallback:(id)target selectedCallback:(SEL)selected_cb
{
 myTarget = target;
 selectedCallback = selected_cb;
 pushed = NO;
}

- (void) selected
{
 [super selected];
 if(isEnabled) {
  pushed = YES;
  [myTarget performSelector:selectedCallback withObject:self];
 }
}

-(void) unselected
{
 [super unselected];
 if(pushed){
  pushed = NO;
 }
}

-(BOOL) isPushed //To know if button is pressed.
{
 return pushed;
}
@end

To use this component, code is like

-(id) init //initializer of virtual control pad layer.
{
    MenuItem *leftButton  = [VirtualButton itemFromNormalImage:@"left_up.png"  selectedImage:@"left_down.png"  target:self selector:@selector(leftButtonUpCallback:)];
    Menu *menu = [Menu menuWithItems: leftButton, nil];
    [(VirtualButton*)leftButton  setOnClickCallback:self selectedCallback:@selector(leftButtonDownCallback:)];
    [leftButton  setPosition:ccp(0, 50.0f)];

    [self addChild:menu];
}

-(void) leftButtonUpCallback:(id)sender
{
    .... do mouse down event
}