为了设置筛选器，把鼠标移动到列标题的左边。
To set a filter, fly over the left-hand side of a column header.
当 AutoGenerateEditButton 属性设置为真时，GridView 显示附加的一列，如图 13 中最左边一列。
When the AutoGenerateEditButton property is set to true, the GridView displays an additional column that looks like the leftmost column in Figure 13 .
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