canPerformAction not use in IOS 5.1

Under the previous wording, the following statement will only show my custom buttons

- (BOOL) canPerformAction: (SEL) action withSender: (id) sender
{
if (action == @ selector (dosth))
{
return YES;
}
return NO;
}


But XCODE upgrade to 4.3.2, the simulator when
with IOS 5.1Displays COPY | SELECT ALL | DEFINE
How to engage in it?
Reply:
4.3.2 I have not upgraded, I'll try to find the right way you please tell me the following.
Reply:
It is better to view the latest documents ~
Reply:
I installed xcode4.3.2, with 5.1 simulator tests, was quite normal, fear is a problem with your code?
Reply:
Official code CopyePasteTile in xcode4.2, no problem using the ios5.1; (sdk 5.1 is copied to xcode4.2 directory inside of ways to use sdk 5.1);

So, if the code is not a problem, the problem is xcode4.3.2