Does anyone know how I can get a RadGrid column to filter on multiple items? I'm creating a custom GridTemplateColumn that contains a list of valid customers. I want to add to Group List to the drop down (Group A, Group B). If the user selects one of these then I want to filter based on all customers in Group A or Group B. I can get it to work using a button outside of the grid using the following.
Grid.MasterTableView.FilterExpression = "([CUSTOMER] = 'CUST1' OR [CUSTOMER] = 'CUST2') AND ([FLAG] = 'Y')";
I can't get it to work using the GridTemplateColumn because it will always try to filter on the selected value, which in this case would be "Group A"
I am using Telerik controls version 2.0.50727. Upgrading is not an option.
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