-public abstract class GStructureViewer extends JInternalFrame implements
- JalviewStructureDisplayI, ColourChangeListener
+import jalview.api.structures.JalviewStructureDisplayI;
+import jalview.gui.ColourMenuHelper.ColourChangeListener;
+import jalview.util.ImageMaker.TYPE;
+import jalview.util.MessageManager;
+
+@SuppressWarnings("serial")
+public abstract class GStructureViewer extends JInternalFrame
+ implements JalviewStructureDisplayI, ColourChangeListener