Unfortunately not - I had tried that one before posting!  I've attached a sample/demo project with that styling change applied - perhaps I've misunderstood.

The combo outside the grid has that style and behaves the way I'm hoping for - the drop down is wider than the control itself.

In the grid, you can see a combo with the same definition in the first column but it doesn't have the wider drop down

Thanks
James

HI ,

 You could wire up the XamComboEditor's Opening and Closeing events and change the column's width.

 Here a code snippet:

private void XamComboEditor_DropDownOpening(object sender, System.ComponentModel.CancelEventArgs e)
        {
         //   xamgrid1.Columns["Reference"].ColumnLayout.ColumnWidth = new ColumnWidth(100, false);
            xamgrid1.Columns.DataColumns["Reference"].Width = new ColumnWidth(100, false);
        }

        private void XamComboEditor_DropDownClosing(object sender, System.ComponentModel.CancelEventArgs e)
        {
            xamgrid1.Columns.DataColumns["Reference"].Width = new ColumnWidth(30, false);
        }

 Sincerely,
 Matt
 Developer Support Enginee

HI.

 I am following up on this forum thread?
 Pleae let me know if you need further assistance.

 Sincerely.
 Matt
Developer Support Engineer

It's not great - why do I have to resize the column to have a wider dropdown?  It's modal and transient, shouldn't it be possible to make it resize automatically?

As it is, working out how wide to make the column is not something for the impatient if a fixed wider width isn't acceptable.  

Thanks for your help

James