Hello Alexander,

One possible solution is to handle the MouseUp event. In this event you can check the UIElement where the mouse was when click was performed. Check if this UIElement is RowUIElement or if any of its ancestors is such element. If so get the Row of the RowUIElement and activate it. Here is how you can achieve this:

private void UltraGrid1_MouseUp(object sender, MouseEventArgs e)
{
    var grid = sender as UltraGrid;
    if(grid == null)
        return;

    //  If this is not Right mouse button return
    if(e.Button != MouseButtons.Right)
        return;
    //  Get the element under the mouse location
    var element = grid.DisplayLayout.UIElement.ElementFromPoint((e.Location));
    //  Check if the element is RowUIElement or if some of its ancestors
    //  is RowUIElement
    RowUIElement rowElement = null;
    if(element is RowUIElement)
        rowElement = element as RowUIElement;
    else
        rowElement = element.GetAncestor(typeof(RowUIElement)) as RowUIElement;
    //  If we have found a RowUIelement get its Row and activate it
    if(rowElement != null)
        rowElement.Row.Activate();
}

Please let me know if you have any additional questions.