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To provide a custom cell editor for a column you would add your custom editor to the CellEditingTemplate. The following XAML example demonstrates how to add a custom cell editor, such as a DatePicker, using the CellEditingTemplate property on a specific column.
In XAML
<c1:FlexGrid AutoGenerateColumns="False">
<c1:FlexGrid.Columns>
<c1:GridColumn Binding="Hired">
<c1:GridColumn.CellEditingTemplate>
<DataTemplate>
<DatePicker Date="{Binding Hired, Mode=TwoWay}"/>
</DataTemplate>
</c1:GridColumn.CellEditingTemplate>
</c1:GridColumn>
</c1:FlexGrid.Columns>
</c1:FlexGrid>