Windows Mobile cliprectangle!

During the development of Windows Mobile, do not rely on the cliprectangle attribute to determine the size of the screen display area, because the value determined by cliprectangle may be smaller than that of the display screen! Because Windows Mobile calls the onpaint method to request that the repainting area is only an invalid (re-painting required) area! For example, if a widget becomes invisible on the form, the onpaint method is triggered. The area represented by cliprectangle is the area occupied by the Child widget!