grid里的数据帮助列由不同数据源组成的情况

用grid的ShowEditor事件解决

   private void gzExtTreeList_ShownEditor(object sender, EventArgs e)

        {

            if (gzExtTreeList.FocusedColumn.FieldName == "itemno" && gzExtTreeList.ActiveEditor is LookUpEdit)

            { 

                object value=gzExtTreeList.FocusedNode.GetValue("sontype");

                DataView dv = new DataView(itemdataHelper, string.Format("itemtype='{0}'",value),string.Empty,DataViewRowState.Unchanged);

                lookupEditTemp.DataSource = dv;

            }

        }