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我在AppleScriptObjC中構建應用程序，我有一個初學者問題 - 如何處理單擊應用程序中的選項卡按鈕？我試圖讓每個標籤都有不同的尺寸。我可以調整窗口大小，但不能在點擊選項卡時調整大小。無論如何，我已經連接到委託 
檢測選項卡視圖更改Xcode OSX AppleScriptObjC
和這樣的標籤頁面，並增加了一個didSelectTabView功能如下：
on didSelectTabViewItem_(tabItem)
display alert "Testing"
end didSelectTabViewItem_
...我收到以下錯誤：
2013-05-30 18:50:10.970 MacUtil[16354:303] Error setting value for key path self of object <AppDelegate @0x1005d3040: OSAID(4)> (from bound object <NSTabView: 0x101c05490>): [<AppDelegate 0x1005d3040> setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key self.
2013-05-30 18:50:10.972 MacUtil[16354:303] (
0 CoreFoundation 0x00007fff911210a6 __exceptionPreprocess + 198
1 libobjc.A.dylib 0x00007fff9522e3f0 objc_exception_throw + 43
2 CoreFoundation 0x00007fff91120ee8 +[NSException raise:format:arguments:] + 104
3 AppKit 0x00007fff92e3414c -[NSBinder _setValue:forKeyPath:ofObject:mode:validateImmediately:raisesForNotApplicableKeys:error:] + 902
4 AppKit 0x00007fff92e33d6d -[NSBinder setValue:forBinding:error:] + 248
5 AppKit 0x00007fff93493625 -[NSViewStateBinder _setValue:forBinding:errorFallbackMessage:] + 63
6 AppKit 0x00007fff933a5198 -[NSTabViewBinder tabView:didSelectTabViewItem:] + 330
7 AppKit 0x00007fff934b9c75 -[_NSBindingAdaptor tabView:didSelectTabViewItem:] + 136
8 AppKit 0x00007fff92fe9029 -[NSTabView selectTabViewItem:] + 1172
9 AppKit 0x00007fff9303ea8c -[NSTabView mouseDown:] + 156
10 AppKit 0x00007fff92fad60e -[NSWindow sendEvent:] + 6853
11 AppKit 0x00007fff92fa9744 -[NSApplication sendEvent:] + 5761
12 AppKit 0x00007fff92ebf2fa -[NSApplication run] + 636
13 AppKit 0x00007fff92e63cb6 NSApplicationMain + 869
14 MacUtil 0x0000000100000f0a main + 74
15 libdyld.dylib 0x00007fff93a297e1 start + 0
16 ??? 0x0000000000000003 0x0 + 3
)
任何幫助，將不勝感激！