Thanks Boris,

That did the trick nicely.

Hello Paul,

I can see the issue now. You could narrow it even more by checking if the item is a 'HeaderBase' and add one more else - something like this:

 if (e.RowLayoutItem is UltraGridColumn)
            {
                // If the RowLayoutItem is an instance of UltraGridColumn, then cells associated
                // with that column are being resized.
                UltraGridColumn column = (UltraGridColumn)e.RowLayoutItem;

                Debug.Write("Cell in row-layout resized. Column = " + column.Header.Caption);
            }
            else if (e.RowLayoutItem is HeaderBase)
            {
                // If the RowLayoutItem is an instance of HeaderBase, then column header (also 
                // referred to as column label) is being resized.
                HeaderBase header = (HeaderBase)e.RowLayoutItem;

                Debug.Write("Header in row-layout resized. Header = " + header.Caption);
            }
            else
            {
                // if the item is a CellLayoutItem..............
                //
            }

Please let me know if I misunderstood you requirement, I will be glad to assist you further.

Thanks Boris,

The problem I have with this solution is I do not know how to find out which column has been resized.

Any ideas?

Many Thanks
Paul 

Hello Paul,

I think that I got it now. You could put the following code in the 'else' body:

BindingFlags bf = BindingFlags.CreateInstance;
foreach (BindingFlags bfs in Enum.GetValues(typeof(BindingFlags))) bf = bf | bfs;
UltraGridColumn col1 = e.RowLayoutItem.GetType().GetField("Column", bf).GetValue(e.RowLayoutItem) as UltraGridColumn;

'Col1.Key' will give you the key of the resized column.

Please do not hesitate to ask if something comes up.

That is excellent!

Thank you very much Boris for all your help.

I am really happy that you were able to achieve what you were looking for with the resizing. I will be glad to assist you in the future if you have any questions.