public void SetProxy(IAopProxy target)
{
Shape shape = target as Shape;
if (shape == null)
throw new ArgumentException("target is not an IShape");
this.shape = shape;
DesignableAttribute attrib = (DesignableAttribute)shape.GetType().GetCustomAttributes(typeof(DesignableAttribute), true)[0];
this.FillColor = attrib.FillColor;
this.BorderColor = attrib.BorderColor;
this.BorderSize = attrib.BorderSize;
}