To invoke the Item Template Designer, switch to the design view and invoke the diagram's smart tag menu. Switch to the MVVM behaviors and Services tab and select Run Template Designer within the Properties group of the corresponding behavior.
Customizing Items and Binding to Data
To define the appearance of connectors, drag a connector to the canvas and apply the desired settings.
To define the appearance of items representing data objects, drag a template from the Template Designer category of the toolbox onto the canvas and customize it as needed. Individual data fields are represented by Text and Image elements. You can bind items to data fields using the Item Data Binding Editor. To invoke it, double-click an item or click the item within the Editor. To bind an item to a data field, type the field name.
The Save changes to the source option specifies whether to apply the TwoWay binding mode, which automatically updates the data field value based on changes in the diagram item's text. This option is only in effect if the behavior's DiagramDataBindingBehaviorBase.EnableNotificationToSource property is set to true.
The Save changes to the source option is only available for simple binding expressions. To build complex binding expressions, use the Criteria Language Syntax.