系统皮肤支持。程序员自己编写的控件类默认重绘时，背景会变成白色。这个代码示例说明怎样让背景和手机皮肤一直。可用-Skin support system. Programmers write their own default redraw the control class, the background will become white. This code sample shows how to skin the background and the phone has. Availabl