Code

ShapeNode mainNode = new ShapeNode(diagram);

int height = 30;

int width = 30;


var format = new StringFormat();
                format.Alignment = StringAlignment.Center;
                format.LineAlignment = StringAlignment.Far;
                format.FormatFlags = StringFormatFlags.NoWrap;
                format.Trimming = StringTrimming.EllipsisCharacter;

                mainNode.EnableStyledText = true;
                mainNode.PolygonalTextLayout = false;
                mainNode.TextFormat = format;
                mainNode.ClipToBounds = true;

                mainNode.AnchorPattern = null;
                mainNode.HandlesStyle = HandlesStyle.SquareHandles | HandlesStyle.EasyMove;
                mainNode.EnabledHandles = AdjustmentHandles.ResizeHandles | AdjustmentHandles.Move;
                diagram.Nodes.Add(mainNode);



mainNode.Shape = stickyNoteShape;
                height = note.ObjectHeight;
                width = note.ObjectWidth;

                if (width == 30)
                {
                    width += note.XPos;
                    height += note.YPos;
                }

                mainNode.Bounds = new Rect(new Point(note.XPos + xOffset, note.YPos + yOffset)
                        , new Size(width - note.XPos, height - note.YPos));
                mainNode.Brush = new SolidColorBrush(Color.FromArgb(95, 211, 211, 211));
                mainNode.Pen = new Pen(new SolidColorBrush(Color.FromRgb(189, 186, 105)), 1);
                Uri uri = new Uri(App.GetImagesPath() + Image
                mainNode.Image = new BitmapImage(uri);
                mainNode.ImageAlign = ImageAlign.TopLeft;
                mainNode.Text = note.NoteName;
                mainNode.TextBrush = Brushes.Black;
                mainNode.ZIndex = 0;