context:     onKeyPress: function(event)    {        if (this.editing || isControl(event) || isShift(event))            return;                if (event.keyCode == KeyEvent.DOM_VK_UP)            this.selectNodeBy("up");        else if (event.keyCode == KeyEvent.DOM_VK_DOWN)            this.selectNodeBy("down");        else if (event.keyCode == KeyEvent.DOM_VK_LEFT)            this.selectNodeBy("left");        else if (event.keyCode == KeyEvent.DOM_VK_RIGHT)            this.selectNodeBy("right");        else            return;                cancelEvent(event);    },
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