1·Change screen BackColor when screen or caller picture is pressed while unlocking.
改变屏幕背景色或来电时，屏幕画面时按下开锁。
2·The BackColor property inherited from WebControl indicates the default background color.
默认的背景色由从WebControl继承的backgroun d属性指定。
3·Besides that, you can of course change ForeColor and BackColor, which also support transparency.
除此之外，你当然可以改变前景色和背景色，这也支持透明。