[tvitem retain];
[GetNSTabView() removeTabViewItem:tvitem];
// Remove the child window as a notebook page
- wxASSERT([tvitem view] == page->GetNSViewForSuperview());
+ wxASSERT(static_cast<NSView*>([tvitem view]) == page->GetNSViewForSuperview());
[tvitem setView:nil];
[tvitem release];
// Make it back into a normal child window