extjs3报错：this.keyNav is null 运用在window里使用RowEditor 有datepicker时的一个bug

extjs3报错：this.keyNav is null 使用在window里使用RowEditor 有datepicker时的一个bug

Bug with RowEditor and destroying DatePickers with fix

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使用extjs3.0 里rowEditor.js???? 在window里 报错：this.keyNav is null

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查找原因找到

http://www.sencha.com/forum/showthread.php?79605-FIXED-2.2-DatePicker.beforeDestroy-NULL-Exception

bug修复：

http://www.sencha.com/forum/showthread.php?75294-FIXED-3.0.0-Bug-with-RowEditor-and-destroying-DatePickers-with-fix

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rowEditor.js 源代码：
grid.on({
scope: this,
keydown: this.onGridKey,
columnresize: this.verifyLayout,
columnmove: this.refreshFields,
reconfigure: this.refreshFields,
beforedestroy : this.beforedestroy,
destroy : this.destroy,
bodyscroll: {
buffer: 250,
fn: this.positionButtons
}
});

修正：
var scope = this;

grid.on({
scope: this,
keydown: this.onGridKey,
columnresize: this.verifyLayout,
columnmove: this.refreshFields,
reconfigure: this.refreshFields,
destroy : function () { scope.removeAll(false); scope.destroy(); },
bodyscroll: {
buffer: 250,
fn: this.positionButtons
}
});?