Error when added grid in a popupview content

Vaadin 6 / 7 / 8
1

I have opened this ticket because i try to add a Grid in a popup view content and received an error in console like this:

SEVERE: Exception caught: Cannot iterate through widgets in Grid this waycom.google.gwt.event.shared.UmbrellaException: Exception caught: Cannot iterate through widgets in Grid this way

and the popup doesn’t respond and stay always visible


dev.vaadin.com/ticket/19920#ticket