介绍一个CButton的派生类CLinkButton，用此派生类制作的按钮具有以下特点：

1、按钮的外观类似静态控件类CStatic 产生的对象。

2、当鼠标的光标移到按钮上，但并未按下时，光标改变形状，字体改变形状；按钮类似应用在工具条和菜单上的扁平钮效果。

3、当按钮按下时有立体感（凹凸）。-Introduce a CButton derived class CLinkButton, use this button to create a derived class has the following characteristics: 1, the button looks like a static control type CStatic object created. 2, when the mouse cursor to the button, but not pressed, the cursor changes shape, font change shape　similar applications in the toolbar button and menu button on the flat results. 3, when the button is pressed, a three-dimensional (convex).