应当已经选择第一个单元格；如果未选择，只需要单击它来选择。
The first cell should already be selected; if not, just click in it to select it.
单击该单元格的最右端以显示一个箭头键并选择Build Expression。
Click the far right corner of this cell to display an arrow key and select Build Expression.
其中的一个例子就是在DataGrid中通过单击单元格来选择一行，而现在以GridView的selectionmode属性的方式暴露出来。
One such example is row selection on cell click, which is now exposed by the GridView as the SelectionMode property.
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