drop down list in a grid

[mww]

I have a grid that uses a RADCombo for selection values in a row.  When I select 'Edit' Ive put some code in the ItemCreated event that populates the dropdown from a custom object.  This all works fine except that the dropdown list always shows the first item in the list.  I need to pre-select the value in the dropdown that matches the value in the grid

eg  in the grid column I have "80's"

the drop down has 2 values  "70's"  and "80's" and it always shows "70's" as the value when in fact is should be "80's"

How can I get the value from the cell to pre-select the value ?

Heres how im getting the drop down

protected void RadGridSecondaryCategories_ItemDataBound(object sender, GridItemEventArgs e)
        {
            if (e.Item is GridEditableItem && e.Item.IsInEditMode)
            {




                GridEditableItem _item = (GridEditableItem)e.Item;


                Telerik.Web.UI.RadComboBox cb = (Telerik.Web.UI.RadComboBox)_item["Category"].FindControl("RadComboBoxCategories");
                cb.DataSource = categorymanager.Categories(this.RadComboBoxArtistGenre.SelectedValue, this.RadComboBoxType.SelectedValue);
                cb.DataTextField = "Category";
                cb.DataValueField = "Category";
                cb.DataBind();


                //TO DO:
                //put code here to find the item in the dropdown from the database

                TableCell cell = _item["Category"];


                int index = this.RadComboBoxCategories.FindItemIndexByValue();--- need to get the cell value and put it here
                cb.SelectedIndex = index;


            }
        }

[Princy]

Hello Mark,

You can try out the following code select values in the dropdown that matches the grid value.
cs:

 if (e.Item is GridEditableItem && e.Item.IsInEditMode)
        {
            GridEditableItem dataitem = (GridEditableItem)e.Item;
            RadComboBox cb = (RadComboBox)dataietm["Category"].FindControl("RadComboBoxCategories");
                cb.DataSource = categorymanager.Categories(this.RadComboBoxArtistGenre.SelectedValue, this.RadComboBoxType.SelectedValue);
                cb.DataTextField = "Category";
                cb.DataValueField = "Category";
                cb.SelectedIndex = e.Item.ItemIndex;
                cb.DataBind();

        }

Thanks
Princy.