@Override
		public Object getValueAt( int rowIndex, int columnIndex ) {
			Item item = items[rowIndex];
			switch( columnIndex ) {
				case 0: return item.key;
				case 1: return item;
			}
			return null;
		}
Creates a UI defaults inspector panel that can be embedded into any window.
flatlaf-extras/src/main/java/com/formdev/flatlaf/extras/FlatUIDefaultsInspector.java