Being apprised of when NSStatusItem is hidden

I have an app which uses NSStatusItem. On small screens, there's not much space in the status bar. When a user switches to an application with a lot of menu items, my status item gets hidden. Is there a way to get notified about this?

What I tried so far:

• I checked if any NSNotification is fired: No
• I checked if the statusView is removed from the view hierarchy: No
• I checked isHiddenOrHasHiddenAncestor: No

Here's the code I use to create the status item.

self.statusItem = [[NSStatusBar systemStatusBar] statusItemWithLength:NSVariableStatusItemLength];
MyStatusView *maView = [[[MyStatusView alloc] initWithFrame:CGRectMake(0, 0, 50, 22)] autorelease];
[statusItem setTitle:@"Ma Status Item"];
[statusItem setView:maView];