Hi,
In my grid, where user click con column header I want to manage both sorting and column selection.

Column selection shoud be activate when user press Alt key and click on the column header. Otherwise only with header click grid should sort the column.

This is my code, default grid setting are for sorting columns.

private void grid_MouseDown(object sender, System.Windows.Forms.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)
                return;
            
            if ((Control.ModifierKeys & Keys.Alt) == Keys.Alt)
            {
                columnHeader.Column.SortIndicator = SortIndicator.Disabled;
                grid.DisplayLayout.Override.HeaderClickAction = HeaderClickAction.Select;
            }
            else
            {
                if (columnHeader.Column.SortIndicator == SortIndicator.Disabled)
                    columnHeader.Column.SortIndicator = SortIndicator.Ascending;

                grid.Selected.Columns.Clear();
                grid.DisplayLayout.Override.HeaderClickAction = HeaderClickAction.SortMulti;
            }

        }

It woks but not perfectly. For exmple when the first time click on header pressing Alt, the sort indicator is removed but the selection on column is not visible. Now if I only click on header (without Alt key pressed) grid sort the column and now show the  selection on column.

What should I do to achieve the desired behavior?

Thank you vey much