Oh, right I just did it in the webIDE with run configs AND in the index.html, but it still works fine. It has something to do with the launchpad on the gateway? Though expression binding works fine, only not in that dialog and with the way the expression binding is, it's quiet longer than what I have in the master or detail page.
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so I think maybe I have to do something with data-sap-ui-xx-bindingSyntax like said before in launchpad since it doesn't use HTML? But the weird thing is that other expression bindings does work...