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wpf treeview not render good

Posted By:      Posted Date: September 10, 2010    Points: 0   Category :WPF
I am a new wpf developer. Now , I have a problem with treeview. every time the page shows, the tree view item always mixup , need clicke a couple times to show clear. when i click on items, some time clear, some time no. anyone can help?

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