Hey,
how about something like this:
var w = new qx.ui.core.Widget().set({
width: 300,
height: 300,
backgroundColor: "red"
});
this.getRoot().add(w, {left: 10, top: 10});
var p = new qx.ui.popup.Popup();
p.set({width: 100, height: 60});
this.getRoot().add(p);
// calculation
var l = w.getLayoutProperties().left + (w.getWidth() / 2) - (p.getWidth() /
2);
var t = w.getLayoutProperties().top + (w.getHeight() / 2) - (p.getHeight() /
2);
p.placeToPoint({left: l, top: t});
p.setVisibility("visible");
Regards,
Martin
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