Yes, I see. Unfortunately this is not a suported scenario -- EditorControlID uses interface that is only supported by Infragistics "editor" controls - like WebCombo, WebDataChooser, WebTextBox, WebPercentEdit, etc. Stock controls like multi-select asp:ListBox are not supported.

The closest I see to this would be using RowEditTemplate and placing the listbox inside the template.

Indeed, a bit more information is needed.

 I know that upon editing a row, you can use different controls one of which being ColumnType.Custom
What I'm looking for is this:

I've got a webgrid containing information that can be edited. One of these columns should be able
to open a Listbox from which several items can be selected. the selected items would then be placed in the cell
as 'Item1;Item3;Item...'

I was wondering if I could use the Columntype.Custom and then give the ID of a Listbox in
the UltraGridColumn.EditorControlID

 HTH

Hello,

I am not exactly sure I understand the question about ListBox -- do you mean asp:dropdown? If so, the dropdown is not supported as a custom edtitor -- this is only supported by the Infragistics editor controls. You have a few alternatives:

1. Use infragisics WebCombo instead of asp:dropdown

2. Use the specil GridColumn of Type "DropDown" the grid support

3. Use templated column and place anything you wish inside the CellTemplate of the column.

HTH,

Would this also work for a ListBox?