Devexpress xtra grid


I am using dev express xtra grid control in my application where i have to show a list of customers on a grid which is grouped by country. i have a checkbox column to select a customer, now i want to place a check box on the group header. if that is checked then all the check boxes on the child rows should be checked (its just like select all)

thanks in advance
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says to download the example b/c it shows how to implement this.

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how was it not useful? it said it was an example of exactly what you were looking for.
as in the other question i would like the points or an explanation -- i apologize for my confusion.
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