Kevin,

It's almost working. I needed to get an instance of the mmRADComboBox to pass in to the this.BindData() method. I was able to do this in the following code

    protected void grdOddDaysRequest_ItemCreated(object sender, GridItemEventArgs e)
    {
        if (e.Item is GridFilteringItem)
        {
            mmRADComboBox filterCombo = e.Item.FindControl("uiFilterRounding") as mmRADComboBox;
            this.BindControl(filterCombo);           
        }  

    }

However, for some reason it seems to be binding twice or something because my list of items in the combo box are duplicated. Do you know what could be causing this?

Al