When I change the Style property of a Link programmatically to LinkStyle.Cascading, the below Error was caught.

User Agent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; Trident/4.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; InfoPath.2; MS-RTC LM 8; .NET4.0C; .NET4.0E)
Timestamp: Fri, 4 Nov 2011 04:38:22 UTC


Message: Unhandled Error in Silverlight Application
Code: 4004
Category: ManagedRuntimeError

Message: System.ArgumentOutOfRangeException: Index was out of range. Must be non-negative and less than the size of the collection.
Parameter name: index
at System.ThrowHelper.ThrowArgumentOutOfRangeException(ExceptionArgument argument, ExceptionResource resource)
at System.ThrowHelper.ThrowArgumentOutOfRangeException()
at System.Collections.Generic.List`1.get_Item(Int32 index)
at MindFusion.Diagramming.Silverlight.DiagramLink.x4cf22ee19af1c11d(Point x3bd62873fafa6252, InteractionState xab29833053004740)
at MindFusion.Diagramming.Silverlight.DiagramLink.UpdateDrag(InteractionState ist)
at MindFusion.Diagramming.Silverlight.InteractionState.Update(Point currentPoint)
at MindFusion.Diagramming.Silverlight.BehaviorBase.OnMouseMove(MouseEventArgs e)
at MindFusion.Diagramming.Silverlight.Diagram.x2c5d1da1234c3a6a(Object xe0292b9ed559da7d, MouseEventArgs xfbf34718e704c6bc)
at MS.Internal.CoreInvokeHandler.InvokeEventHandler(Int32 typeIndex, Delegate handlerDelegate, Object sender, Object args)
at MS.Internal.JoltHelper.FireEvent(IntPtr unmanagedObj, IntPtr unmanagedObjArgs, Int32 argsTypeIndex, Int32 actualArgsTypeIndex, String eventName)

No, I have my custom XML format containing nodes and links and I am trying to create shape nodes and diagram links through code. I am using the Factory.CreateDiagramLink()

code as below:

DiagramLink newlink = diagramInstance.Factory.CreateDiagramLink(
nodeMap[link.Attribute("BeginActivityUniqueID").Value] as ShapeNode,
Convert.ToInt32(link.Element("UILayout").Element("BeginConnectionPoint").Value)
,
nodeMap[link.Attribute("EndActivityUniqueID").Value] as ShapeNode,
Convert.ToInt32(link.Element("UILayout").Element("EndConnectionPoint").Value));


newlink.Style = LinkStyle.Cascading

The error occurs when I try to detach the head of the link from the end node.