1.Ext.draw.engine.Canvas doesn't work;

2.
Code:
 createSurface:function(){
        var surface = Ext.draw.Surface.newInstance(Ext.apply({}, {
                width: this.width,
                height: this.height,
                renderTo: this.el
            }, this.initialConfig),this.implOrder);

3.Ext.draw.engine.VML not support type:'image'

4.createContextualFragment error on IE9

5. button overCls and pressedCls config not apply

6. button on museover fire addCls,but on museout can't remove overCls