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Issue when scrolling when using popup

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Hi,

I'm using a popup overlay on images in the listbox/wrappanel. This causes the following error when scrolling outside of the current view: (loading new items)

An unhandled exception of type 'System.InvalidOperationException' occurred in mscorlib.dll Additional information: Collection was modified; enumeration operation may not execute

More info: https://stackoverflow.com/questions/25946842/open-popup-when-item-in-listbox-isselected


Do you have any idea on how to fix this? :)

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