定义一个选项子类，因为这个控件中的图片中包含文字，没有将子项的文字画到控件当中去，如果有需求的话可以修改OnPain事件，添加一个画文字的方法。-Define a subclass option, because this controls the picture contains text, the text does not draw the children were to go to the control, if there is a demand, then you can modify OnPain event, add a text painting method.