Stopping a popover window becoming the key window

I am trying to write a Mac application which runs in the menubar, which when clicked, displays an iOS-like popover. Similar to Flexibit's Fantastical, or The Iconfactory's Take Five.

I am using INPopoverContr开发者_如何学Gooller which seems to work great. My problem is that when the user clicks on anything in the popover view, the popover becomes the key window. Is there a way to stop this from happening?

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In INPopoverWindow:

- (BOOL)canBecomeKeyWindow
{
    return YES;
}

means that the popover can become a key window. You can either change it to return NO, or subclass INPopoverWindow and override that method to return NO.