急！请问如何动态绑定 Attribute

[youzelin]

1）我自定义一个 CButton 控件，继承 Button
2）定义两个类：AutoSizeDesigner 和 LeftRightDesigner，他们均继承于 System.Windows.Forms.Design.ControlDesigner

	public class AutoSizeDesigner : ControlDesigner
	{
		public override SelectionRules SelectionRules
		{
			get
			{
				SelectionRules rules = SelectionRules.Visible | SelectionRules.Moveable;
				return rules;
			}
		}
	}

	public class LeftRightSizeDesigner : ControlDesigner
	{
		public override SelectionRules SelectionRules
		{
			get
			{
				SelectionRules rules = SelectionRules.Visible | SelectionRules.Moveable | SelectionRules.LeftSizeable | SelectionRules.RightSizeable;
				return rules;
			}
		}
	}

3）CButton 这样定义

	[Designer(typeof(LeftRightSizeDesigner))]
	public partial class CButton : System.Windows.Forms.Button
	{
		// ......
	}

4）我想在设计时：当 AutoSize = false 时，Designer 为 LeftRightSizeDesigner；而 AutoSize = true 时，Designer 为 AutoSizeDesigner，请问如何实现，谢谢。

[youzelin]

有知道的吗？谢谢