代码说明： TjanRunButton is a TGraphicControl descendant. Drop it on a form without code or properties to set and that is it. The user can right-click the button to select a program and left-click the button to launch that program. The program Icon is displayed on the button and the Hint shows the program name. The program name auto persists in the application ini file. 显示外部程序图标和提示的按钮

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