在开发程序时，有时需要在状态栏中放置一些控件，实现特殊的设计效果或功能。本列在状态栏中放置进度条，显示当前程序执行进度。-In the development process, sometimes need to put some controls in the status bar to achieve special design effects or features. This column in the status bar to place the progress bar show