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ItemClickListener do not work in Internet Explorer 8
If I click on a tree in Chrom browser, whereas the method of listener calls fine, but if you click at Internet Explorer 8, then click is fulfilled only if you click again, but it passed the previous element of choice... it is a bug?
ItemClickListener in a Tree seems to work perfectly with IE8 at http://demo.vaadin.com/sampler#TreeMouseEvents.
Your problem is probably related to some specific details in your project, e.g. a custom theme or some add-on causing incompatibilities. You could also check the Vaadin debug console (by adding ?debug to the URL) to see if any error message indicating problems is logged.