说明：  TabControl demo. Awhile back, I wanted to use the tab control in a Win32 SDK C project. The low-level implementation proved to be somewhat cumbersome. A search of the Web turned up a lot of examples based on MFC, but very little along the lines of plain old C. What I did find did not support keyboard navigation. After extensively using tab controls in VB.NET, I had an idea of what features would make for an easy-to-implement Win32 tab control.