beginSheet:ModalForWindow:modalDelegate:didEndSelector:contextInfo: in Leopard

FROM : Damian Terentiev
DATE : Fri Jan 11 19:21:48 2008

Hi!
I have a problem calling a custom sheet in Leopard.
When I call
    [NSApp beginSheet:panel
      ModalForWindow:window
      modalDelegate:self
      didEndSelector:@selector(didEndSheet:returnCode:contextInfo:)
        contextInfo:info];
I get a no '-
beginSheet:ModalForWindow:modalDelegate:didEndSelector:contextInfo:' 
method found warning and it doesn't work.
The documentation about sheets was not updated for Leopard.
Is it a bug and is there any workaround?

Yours,
Damian Terentiev