There was a missed case in the wrappers for RadComboBox. It was searching for StackPanel
but in this case the container is VirtualizingStackpanel
. We fixed it and it will not crash in next version of the framework. However if you want to check the count of all items it will not work. WebAii framework depends on the items in the visual tree and it will take into account only the visible items. So if you have 1000 items for example the count will return just 11(the visible ones). This is how virtualization works and if these items are not in the visual tree we can't do nothing about it.
I have updated your Telerik points for your report. Don't hesitate to contact us if you have further questions.
All the best,
the Telerik team
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