I am using Tree widget in qx.Desktop application and want to populate it on demand. Let say there is a TreeFolder in the Tree widget which is not opened yet, so tchnicaly it is empty. Once user open it (click on +) I want to populate the TreeFolder with items on that click and show expended content. Unfortunately, I was not able to find suitable event fired by Tree widget to use. Could anybody shed a light how it can be achived? Thanks
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