iOS - UIButton event crash
===

I tried the codes of Moshe in this [link][1], and it worked except the part of "for (UIButton *button in ..." and it crashes every time when I click on a button. 

So I tried this code in the viewDidLoad method:
	

    UIButton *testButton = [[UIButton alloc]initWithFrame:CGRectMake(20,50,30,30)];
    	testButton.backgroundColor = [UIColor orangeColor];
    	[testButton setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
    	[testButton setTitle:@"A" forState:UIControlStateNormal];
    	[testButton addTarget:self action:@selector(commonMethodForButtons:) forControlEvents:UIControlEventTouchDown];
    
    	[self.view addSubview:testButton];
    	[testButton release];


My project contains nothing than this and Moshe´s sample codes. Any idea why the app crashes? I get no crash log.


  [1]: http://stackoverflow.com/questions/5656432/create-a-for-loop-to-add-39-buttons-to-an-array