Windows Mobile 5.0 Today Screen Plugin

 发狂了两天，自己写的Plugin为什么显示不出来，原来在CreateWindow里设置的高度根本没用，需要在响应时WM_TODAYCUSTOM_QUERYREFRESHCACHE设置Item高度，不设的话就是0，当然就看不到了。

部署Plugin的步骤(参考：http://www.codeguru.com/cpp/w-p/ce/pocketpc/article.php/c9269__1/)：

To Install

• Place the component DLL in the desired folder
• Add appropriate values to the Registry (see above)
• Send a broadcast message to cause the OS to accept changes:
  SendMessage(HWND_BROADCAST, WM_WININICHANGE, 0xF2, 0)

To Uninstall

• Remove the key you created during Install (HKLM/SOFTWARE/Microsoft/Today/Items/YOURCOMPONENT)
• Send a broadcast message to cause the OS to accept changes:
  SendMessage(HWND_BROADCAST, WM_WININICHANGE, 0xF2, 0);
• Wait to let the OS release your component DLL
• Delete the DLL