Hi, Mike

I am trying the method you proposed in the post http://community.infragistics.com/forums/p/55961/287029.aspx#287029, "hide the "real" column which contains a single string and use an unbound column whose datatype is List<string> for display to the user. You could then use events of the grid to convert the string to a list (InitializeRow) and the list to a String (BeforeRowUpdate)."

During the test, i found the text in the ultraComboEditor disappeared when the cell lose focus, the cell changed to blank. i pasted some code here,

private void ultraGrid1_InitializeLayout(object sender, IWG.InitializeLayoutEventArgs e)

{

// override the backgroud color of the active cell. 

this.ultraGrid1.DisplayLayout.Override.ActiveRowCellAppearance.BackColor = Color.White;

this.ultraGrid1.DisplayLayout.Override.ActiveRowCellAppearance.ForeColor = Color.Black;

this.Columns[StrValue].Hidden = true;  // hide the real bound column

this.Columns.Add(m_fakeColName, "NewValue"); // add a fake column 

this.Columns[m_fakeColName].DataType = typeof(List<string>);

}

// fill the cell with different controls based on the cell content before the active cell

private void ultraGrid1_BeforeCellActivate(object sender, IWG.CancelableCellEventArgs e)

{    

if (e.Cell.Column.Key.Equals(m_fakeColName))

{

string property = e.Cell.Row.Cells[StrProperty].Value.ToString();

if (string.IsNullOrEmpty(property)) return;

if (m_propertyAttriDic[property].CtrlStyle == ControlStyle.CheckedListBox)

{

            Columns[m_fakeColName].Style = IWG.ColumnStyle.DropDownList;

            if (cell.EditorComponent == null)

           {

                    UltraComboEditor editor = new UltraComboEditor();

                    editor.CheckedListSettings.CheckBoxStyle = Infragistics.Win.CheckStyle.CheckBox;

                    editor.CheckedListSettings.ItemCheckArea = Infragistics.Win.ItemCheckArea.Item;

                    editor.CheckedListSettings.EditorValueSource =                           Infragistics.Win.EditorWithComboValueSource.CheckedItems;

                    editor.CheckedListSettings.ListSeparator = new string( FilterHelper.Seperators);

                     editor.ValueList = this.ultraGrid1.DisplayLayout.ValueLists[propertyName];

                     this.Columns[m_fakeColName].EditorComponent = editor;

}

}

}

private void ultraGrid1_BeforeRowUpdate(object sender, Infragistics.Win.UltraWinGrid.CancelableRowEventArgs e)

{ 

List<string> values = e.Row.Cells[m_strFakeValueCol].Value as List<string>;

if (values != null)

{

string newValue = string.Empty;

foreach (string value in values)

{

newValue += value;

if (values.IndexOf(value) < values.Count - 1)

newValue += new string(FilterHelper.Seperators);

}

m_filterList[e.Row.Index].Value = newValue;

}

}

private void ultraGrid1_InitializeRow(object sender, Infragistics.Win.UltraWinGrid.InitializeRowEventArgs e)

{

string value = e.Row.Cells[StrValue].Value as string;

if (!string.IsNullOrEmpty(value))

{

e.Row.Cells[m_strFakeValueCol].Value = new List<string>(value.Split(FilterHelper.Seperators));

}

}

Thanks in advance.

Regards,

louvie