当下拉列表值变化为自定义时，可以通过路径对话框选择路径。-When the drop-down list value changes as a custom dialog box, select the path through the path.

制作一个Hot Ring 按键选择面板，当控件得到焦点时，能够通过键盘输入的方式在Hot Ring的方式下拉列表框中快速定位所要选择的项目。-Make a Hot Ring button selection panel, when the control focus, through the the rid_device_info_keyboard input mode in Hot Ring mode drop- down list box the quick positioning shou