当处于绑定模式时，为了能够在按绑定列对控件进行排序时保留未绑定列的值，此模式是必需的。
This is necessary to maintain the values of unbound columns in bound mode when the control is sorted by bound columns.
当处于绑定模式时，为了能够在按绑定列对控件进行排序时保留未绑定列的值，此模式是必需的。
This is necessary to maintain the values of unbound columns in bound mode when the control is sorted by bound columns.
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