TreeView Persistance with navigation

I am having masive problems getting the TreeView menu to persist when any of the menu links are clicked, i have done extensive searches on the internat and found quite a lot of information on this problem and a few cures, so far i havnt been able to solve this

None of the cures i have found have worked, The most promosing and the only one not to cause an error when implemented was this one from Microsoft
http://msdn.microsoft.com/en-us/magazine/cc163598.aspx#S3 

All the post i found were old posts most recent being late 2007 , with no recent posts concerning this problem,  leads me to believe the problem has been cured, if this is so can someone point it out as i am having trouble finding it, if it hasnt been cured can somebody help me with a work around that will work in VS2008 .net 3.5 C# v3
my data comes from web.sitemap xml and i am using the navigateurlfield for my navigation links

Thank you
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QuinnDesterAsked:
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QuinnDesterAuthor Commented:
This is now solved.. the code in the URL above does work,  but PopulateOnDemand="True" must not be set,
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