Evtim wrote a greate customer FlowLayout, and Maxim also have a nice customer Horizontal Multiline Layout, but they don't support drag-drop, so anyone could give some idea?
Container layouts and drag/drop should be independent. Try one of the drag/drop examples on the internet and see if it works.
I had worked out, see my post on StakckOverflow http://stackoverflow.com/questions/16101244/customer-layout-with-drag-drop-support
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