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Load on demand from ado.net Data Service Cycle error

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Nick Wood
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Nick Wood asked on 04 May 2010, 12:45 AM
Hi There

Using Silverlight 4 with the latest Telerik silverlight 4 controls

I am following the method here: http://www.telerik.com/help/silverlight/radtreeview-populating-with-data-databinding-to-adonet-service.html to load tree view elements on demand from the data service.

When I try to expand and contract tree elements before the sub elements have had a chance to load, I get the following:
Line: 56
Error: Unhandled Error in Silverlight Application
Code: 4008    
Category: RuntimeError       
Message: Layout cycle detected.  Layout could not complete.     
MethodName:      


Is there any way to handle this or lock the control until the sub tree items have had a chance to load. There must be a way to handle this as the users constantly hit this error.

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Nick Wood
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answered on 04 May 2010, 01:42 AM
Actually, I think I have found the issue. it seems to have been causes by the treeview control being wrapped in a scrollviewer. I was lead to this by posts outside of telerik on this issue that reference sizing as the cause of this error. When I removed the scrollviewer, I have not been able to replicate this issue again.
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Tina Stancheva
Telerik team
answered on 06 May 2010, 02:37 PM
Hello Nick Wood,

Thank you for this report.

The problem is that wrapping the control inside a StackPanel or a ScrollViewer will interfere with the virtualization of the control, thus slowing it down.

Can you tell us why you needed a ScrollViewer wrapped around the TreeView?

Best wishes,
Tina Stancheva
the Telerik team

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Nick Wood
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Nick Wood
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Tina Stancheva
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