wpf - How does VirtualizingStackPanel decide when to unload (dispose?) of virtualized controls? -

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i'm working itemscontrol using virtualizingstackpanel in controltemplate. i've got virtualization working, extent. i've put debugging statements in loaded , unloaded event handlers controls in datatemplate items, don't unloaded after controls go out of view. there way force behaviour ?

you might have luck setting virtualizationmode recycled. there comments in source code virtualizingstackpanel.cs indicate recycled mode cleans renderers (instead of doing in background):

    //      // delayed cleanup used when virtualizationmode standard (not recycling) , panel scrolling , item-based     // chooses defer virtualizing items until there enough available.  cleans them using background priority dispatcher      // work item     //

note, can find full source virtualizingstackpanel here:

http://referencesource.microsoft.com/netframework.aspx


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