ASPxGridView - How to implement the Select All feature for GridViewDataCheckBoxColumn when the Batch Edit mode is used

In this example, ASPxGridView is used in Batch Edit mode. The Discontinued column's HeaderTemplate is replaced with ASPxCheckBox. Clicking the header's check box causes setting all cells of the Discontinued column to true by using the ASPxClientGridViewBatchEditApi method.
See also: GridView - How to implement the Select All feature for CheckBox сolumn when the Batch Edit mode is used.