Hi,

To disable the sorting, you can set the SortIndicator on the column to Disabled.

To determine if the mouse is over a column header, you will need to use the UIElements.

        private void ultraGrid1_MouseDown(object sender, MouseEventArgs e)
        {
            UltraGrid grid = (UltraGrid)sender;
            UIElement element = grid.DisplayLayout.UIElement.LastElementEntered;
            Infragistics.Win.UltraWinGrid.ColumnHeader columnHeader = element.GetContext(typeof(Infragistics.Win.UltraWinGrid.ColumnHeader)) as Infragistics.Win.UltraWinGrid.ColumnHeader;

            if (columnHeader != null)
                Debug.WriteLine(columnHeader.Column.Key);
        }