Question

how can i have a ultragrid with 3-way sorting on every columns? I mean :

a. Ascendiing -Indicated by default ascending SortIndicator.

b. Descending- Indicated by default descending SortIndicator.

c. No Sort- UnSort the column.

Note: I have tried BeforeSortChanged Event but i had 2 problems:

1. I could not get the previous column sort indicator to find out when
   should i disable sorting.

2. I have got an Exception where it is saying that we can’t change
   SortIndicator in BeforeSortChange Event

Answer 1

I solved my problem by using UIElement.GetContext() to find clicked column in Mouse Up event handler of my grid and then i checked and changed the sortIndicator property of that column to what i want.

Edit :

private void Grid_MouseUp(object sender, MouseEventArgs e)
{
    if (e.Button == MouseButtons.Left)
    {
        UIElement element = Grid.DisplayLayout.UIElement.ElementFromPoint(new Point(e.X, e.Y));
        if (element == null)
            return;

        ColumnHeader clickedHeader = (ColumnHeader)element.GetContext(typeof(ColumnHeader), true);

        UltraGridColumn clickedColumn;

        if (clickedHeader != null)
            clickedColumn = clickedHeader.Column;

        if (clickedColumn == null)
            return;

        Switch ( clickedColumn.SortIndicator)
        {
           case SortIndicator.Ascending :
               clickedColumn.SortIndicator= SortIndicator.Descending;
               break;
           case SortIndicator.Descending :
               clickedColumn.SortIndicator= SortIndicator.Disabled;
               break;
           case SortIndicator.Disabled :
           default :
               clickedColumn.SortIndicator= SortIndicator.Ascending;
               break;
        }
    }
}