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Created attachment 163822 [details] the project Double clicking on property set throws index out of bounds exception for all sets other than the first (top most). In addition, other UI oddities show up like set properties will disappear and reappear under another set and the +- icons next to the toggle-able sets are linked. Steps to reproduce: 1. Open attached project. 2. Run 3. Toggle the sets in the property sheet on the right hand side.