Hi

i have an UltraTree(ver8.2)  which is databound and displaying multiple columns using ViewStyle = Grid,but when i dragDrop a node ,there show me a error,the error message is "Cannot reposition a node from a bound nodes collection"

i set the AllowDrag = true.

there is my code(without drophightlight):

void UltraTreeX_SelectionDragStart(object sender, EventArgs e)
{
    this.DoDragDrop(this.SelectedNodes, DragDropEffects.Move);
}

void UltraTreeX_DragOver(object sender, DragEventArgs e)
{
    System.Drawing.Point PointInTree;
    PointInTree = this.PointToClient(new Point(e.X, e.Y));

    afterNode = this.GetNodeFromPoint(PointInTree);
    e.Effect = DragDropEffects.Move;
}

void UltraTreeX_DragDrop(object sender, DragEventArgs e)
{
    UltraTreeNode BeforeNode = null;
    SelectedNodesCollection SelectedNodes;
    UltraTreeNode DropNode = new UltraTreeNode();

    SelectedNodes = (SelectedNodesCollection)e.Data.GetData(typeof(SelectedNodesCollection));
    SelectedNodes = SelectedNodes.Clone() as SelectedNodesCollection;
    SelectedNodes.SortByPosition();

    if (SelectedNodes[0].Level == afterNode.Level) 
    {
        for (int i = 0; i <= (SelectedNodes.Count - 1); i++)
        {
            BeforeNode = SelectedNodes[i];
            BeforeNode.Reposition(afterNode.Nodes);
        }
    }
    else if (SelectedNodes[0].Level > afterNode.Level)  //
    {
        for (int i = 0; i <= (SelectedNodes.Count - 1); i++)
        {
            BeforeNode = SelectedNodes[i];
            try
            {
                BeforeNode.Reposition(afterNode, NodePosition.Next);
            }
            catch (Exception ex)
            { MessageBox.Show(ex.Message); }   ----->   here 
        }
    }
}

thanks~