How do I change the type of an auto-generated column after generation?

Hello Telerik-Team,

we would like to use our own columntypes in a RadGrid in order to make the filter control a combobox.

We have the following code in the ColumnCreated-Event:

if (boundColumn.UniqueName.Equals("CaseStage"))

{

grid.MasterTableView.Columns.Remove(boundColumn);

CustomFilteringColumn cfBoundColumn = new CustomFilteringColumn();

grid.MasterTableView.Columns.Add(cfBoundColumn);

cfBoundColumn.DataField = "CaseStage";

cfBoundColumn.HeaderText = "CaseStage";

}

When we then try to filter the Grid using one of the other filter fields we get the following error message:

Uncaught Sys.WebForms.PageRequestManagerServerErrorException: Sys.WebForms.PageRequestManagerServerErrorException: Cannot create column with the specified type name: CustomFilteringColumn

Can you help us interpret the error message or perhaps suggest an alternative way to make the filtercontrol a combobox when using auto-generated columns?

Thank you in advance!

Roxane