This Bugzilla instance is a read-only archive of historic NetBeans bug reports. To report a bug in NetBeans please follow the project's instructions for reporting issues.
PropertySetModelImpl holds set of property sets and properties for the new property sheet, manages their expanded/collapsed state. Events on it get translated to TableModelEvents by SheetTableModel. The current implementation is a bit naive, as it was just written to get the initial impl of the property sheet working - it iterates all the property sets and all the properties of them and puts them into a list structure. Probably for performance, the implementation should be more transparent and not iterate/cache information.
Any rewrite should wait pending revisions of API for properties wrt Looks - and there don't seem to be any significant performance problems here anyway.