private void MySyntaxEditor1_MouseDown(object sender, MouseEventArgs e)
        {  
            CaretPosition pos = mySyntaxEditor1.SyntaxEditorElement.GetPositionFromPoint(GetPosition(e, mySyntaxEditor1.SyntaxEditorElement.EditorPresenter)); 
            CaretPosition start = new CaretPosition(pos);
            start.MoveToCurrentWordStart();
            CaretPosition end = new CaretPosition(pos);
            end.MoveToCurrentWordEnd();
            mySyntaxEditor1.SyntaxEditorElement.Selection.Select(start, end);
        }

 public Telerik.WinControls.SyntaxEditor.UI.Point GetPosition(System.Windows.Forms.MouseEventArgs args, Telerik.WinControls.SyntaxEditor.UI.UIElement element)
        {

            System.Drawing.Point screenLocation = mySyntaxEditor1.SyntaxEditorElement.PointToScreen(args.Location);
            System.Drawing.Point point = element.PointFromScreen(screenLocation);
            Telerik.WinControls.Layouts.RadMatrix matrix = element.TotalTransform;
            matrix.Invert();

            return new System.Drawing.PointF(point.X * matrix.ScaleX, point.Y * matrix.ScaleY);
        }