Solution to adding a checkbox column to cxgrid

I have encountered such a problem before. In cxgrid, you need to add a column to select one or several rows of data. The operation can be performed. The idea is that adding a column is irrelevant to the database, the problem is that only one row can be selected for the columns added to the checkbox attribute. The problem is found today. Not only does cxgrid need to set the keyfieldnames of datacontroller, which is also the unique field of the join table, set the smartrefrsh of datamodecontroller to true. Of course, the added columns must also be editing-enabled.