private void DeleteCurrentSelection()
        {
            foreach (Connection connection in SelectionService.CurrentSelection.OfType <Connection>())
            {
                this.Children.Remove(connection);
            }

            foreach (DesignerItem item in SelectionService.CurrentSelection.OfType <DesignerItem>())
            {
                Control cd = item.Template.FindName("PART_ConnectorDecorator", item) as Control;

                List <Connector> connectors = new List <Connector>();
                GetConnectors(cd, connectors);

                foreach (Connector connector in connectors)
                {
                    foreach (Connection con in connector.Connections)
                    {
                        this.Children.Remove(con);
                    }
                }
                this.Children.Remove(item);
            }

            SelectionService.ClearSelection();
            UpdateZIndex();
        }
        private void Print_Executed(object sender, ExecutedRoutedEventArgs e)
        {
            SelectionService.ClearSelection();

            PrintDialog printDialog = new PrintDialog();

            if (true == printDialog.ShowDialog())
            {
                printDialog.PrintVisual(this, "WPF Diagram");
            }
        }
        private void Paste_Executed(object sender, ExecutedRoutedEventArgs e)
        {
            XElement root = LoadSerializedDataFromClipBoard();

            if (root == null)
            {
                return;
            }

            // create DesignerItems
            Dictionary <Guid, Guid> mappingOldToNewIDs = new Dictionary <Guid, Guid>();
            List <ISelectable>      newItems           = new List <ISelectable>();
            IEnumerable <XElement>  itemsXML           = root.Elements("DesignerItems").Elements("DesignerItem");

            double offsetX = Double.Parse(root.Attribute("OffsetX").Value, CultureInfo.InvariantCulture);
            double offsetY = Double.Parse(root.Attribute("OffsetY").Value, CultureInfo.InvariantCulture);

            foreach (XElement itemXML in itemsXML)
            {
                Guid oldID = new Guid(itemXML.Element("ID").Value);
                Guid newID = Guid.NewGuid();
                mappingOldToNewIDs.Add(oldID, newID);
                DesignerItem item = DeserializeDesignerItem(itemXML, newID, offsetX, offsetY);
                this.Children.Add(item);
                SetConnectorDecoratorTemplate(item);
                newItems.Add(item);
            }

            // update group hierarchy
            SelectionService.ClearSelection();
            foreach (DesignerItem el in newItems)
            {
                if (el.ParentID != Guid.Empty)
                {
                    el.ParentID = mappingOldToNewIDs[el.ParentID];
                }
            }


            foreach (DesignerItem item in newItems)
            {
                if (item.ParentID == Guid.Empty)
                {
                    SelectionService.AddToSelection(item);
                }
            }

            // create Connections
            IEnumerable <XElement> connectionsXML = root.Elements("Connections").Elements("Connection");

            foreach (XElement connectionXML in connectionsXML)
            {
                Guid oldSourceID = new Guid(connectionXML.Element("SourceID").Value);
                Guid oldSinkID   = new Guid(connectionXML.Element("SinkID").Value);

                if (mappingOldToNewIDs.ContainsKey(oldSourceID) && mappingOldToNewIDs.ContainsKey(oldSinkID))
                {
                    Guid newSourceID = mappingOldToNewIDs[oldSourceID];
                    Guid newSinkID   = mappingOldToNewIDs[oldSinkID];

                    String sourceConnectorName = connectionXML.Element("SourceConnectorName").Value;
                    String sinkConnectorName   = connectionXML.Element("SinkConnectorName").Value;

                    Connector sourceConnector = GetConnector(newSourceID, sourceConnectorName);
                    Connector sinkConnector   = GetConnector(newSinkID, sinkConnectorName);

                    Connection connection = new Connection(sourceConnector, sinkConnector);
                    Canvas.SetZIndex(connection, Int32.Parse(connectionXML.Element("zIndex").Value));
                    this.Children.Add(connection);

                    SelectionService.AddToSelection(connection);
                }
            }

            DesignerCanvas.BringToFront.Execute(null, this);

            // update paste offset
            root.Attribute("OffsetX").Value = (offsetX + 10).ToString();
            root.Attribute("OffsetY").Value = (offsetY + 10).ToString();
            Clipboard.Clear();
            Clipboard.SetData(DataFormats.Xaml, root);
        }