当您处于一个嵌套的折叠部分时，此命令会反转光标所在的最内层大纲显示部分当前的隐藏或展开状态。
Reverses the current hidden or expanded state of the innermost outlining section in which the cursor lies when you are in a nested collapsed section.
随即将打开代码隐藏文件，并将光标定位在选定的事件处理程序中。
The code-behind file is opened and the cursor is positioned in the selected event handler.
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