Diagramming for WPF adds support for two visual effects - the GlassEffect and AeroEffect, which can be applied to nodes. Effects can be added, removed or modified at any time and this will immediately reflect on the diagram. You can apply more than one effect of the same type.

A Theme is a collection of styles. Each style in the theme is associated with a specific type of diagram items and affects all items of this type. Themes can be loaded and saved from / to XML files. Use the Theme Editor tool to create your own themes.

The new DiagramDocument class represents a collection of pages (sheets). Each sheet is an instance of DiagramPage. DiagramPage is derived from the Diagram class and adds a Title property. All your current code that uses Diagram objects will work with DiagramPage objects. You can add, modify, rearrange and delete DiagramPage-s with the Pages collection.

The new TabbedDiagramView displays tabs for each DiagramDocument page. You can specify the active page by activating its associated tab. Use the buttons in the tab tray to add and remove pages to/from the document. Drag the tab of a page with the mouse to change its location.

With the new LinkLabel class you can show multiple captions on a single DiagramLink object. The LinkLabel class provides properties for complete customization of the appearance and position of the labels. If you set LinkLabel.AutoArrange to true, labels will arrange themselves automatically in such manner that overlapping with other labels and nodes is avoided.

The new LayerListView control displays all layers of the Diagram together with a title and an overview area. You can edit the Visible and Locked properties of the layer and set the currently active layer. Use the plus (+) button to add new layers to the Diagram.

Now you can assign diagram Item-s into layers. Layers can be locked, hidden moved up or down in the Z-order or as a group. The LayerIndex property specifies the layer of the item. The layers are stored in the Layers collection property. Each Layer has Visible, Locked and ZIndex properties, which affect all items in the layer.

The OneWayLayout class ensures that links enter into nodes from the same general direction and exit them from the opposite side.

The .NET 4.0 version of WpfDiagram takes advantage of the Task Parallel Library (TPL) to enable parallelism on the different layout algorithms. Use the EnableParallelism property to allow different subgraphs to be arranged on different threads. This might improve performance on multiprocessor systems.

The new magnifier tool allows users to interactively zoom in (or out) portions of the diagram by holding down a modifier key or pressing a mouse button. You can customize the magnifier's zoom factor and appearance.

The Shape property in ContainerNode and TreeViewNode can be set to Rectangle or RoundRect;
the value of DiagramItem.ZIndex property is no longer required to be unique and smaller than the number of items;
and more.