WTL实现的演示选择工具及演示,当用户选择按钮时，会弹出颜色选择框，然后按钮会改变成对应的颜色。-CColorBox is a very, very simple control. It shows a color, and when the user clicks on it, the standard color selector in Windows pops up to let the user change the color.-by PEK