问题:

     窗体win上面有两个组件, cb_1 (commandbutton) 和 em_1 (editmask)

现在我在cb_1的clicked的事件下面写 :
      
     em_1.MaskDataType = StringMask!

     em_1.Mask = '@@@,@@'
     
    保存出现如下提示:

         a read only property may only be modified in an event or function in its parent class

    请问如何解决!!!!

    十分感谢!