How to assign itemsource to Autocompletebox place inside devexpress grid (Silverlight)?

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Silverlight

DevExpress

I am doin Silverlight app 4 using devexpress 11.

I have devexpress grid consiting of 4 coloums. i have placed autocompletebox as edit template in one of column.

<dxg:GridControl x:Name="grid_presentingcomplaints">
                            <dxg:GridControl.Columns>
                                <dxg:GridColumn FieldName="Complaints" Header="Complaints/Disease">
                                    <dxg:GridColumn.EditTemplate>
                                        <ControlTemplate>
                                           <sdk:AutoCompleteBox x:Name="t_comp" /> 
                                        </ControlTemplate>
                                    </dxg:GridColumn.EditTemplate>
                                </dxg:GridColumn>
                                <dxg:GridColumn FieldName="Duration" Header="Duration (For)" />
                                <dxg:GridColumn Header="Period" FieldName="Period" />
                                <dxg:GridColumn Header="Details" FieldName="Details" />
                            </dxg:GridControl.Columns>
                            <dxg:GridControl.View>
                                <dxg:TableView Name="tableView3" ShowGroupPanel="False" NewItemRowPosition="Top" />
                            </dxg:GridControl.View>
                        </dxg:GridControl>

I would like to know how to set the autocompletebox itemsource from code side.
Or is there an another method to do this?