I'm facing similar problem as in this topic. I have a compact cluster of few controls and I would like to get listbox-like behavior with it. The natural way to do it is array of clusters. But even with transparent color the cluster frame still has its 4 px thickness, which makes 8 px gap between elements in array. I can't afford this as my cluster without a frame has 10 px height. Did anyone found any new way to overcome it? I have 8.2 - maybe in newer versions anything has changed at this fie