Bug 28575 Hierarchy view updates items twice [type hierarchy]
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/typehierarchy/TypeHierarchyViewPart.java
return new KeyAdapter() {
			public void keyReleased(KeyEvent event) {
				if (event.stateMask == 0) {
					if (event.keyCode == SWT.F5) {
						updateHierarchyViewer();
						return;
					} else if (event.character == SWT.DEL){
						if (fCCPActionGroup.getDeleteAction().isEnabled())
							fCCPActionGroup.getDeleteAction().run();
						return;	
					}
 				}
				viewPartKeyShortcuts(event);					
			}
		};		
	}
	
	private void initializeTypesViewer(final TypeHierarchyViewer typesViewer, KeyListener keyListener, String cotextHelpId) {
		typesViewer.getControl().setVisible(false);
		typesViewer.getControl().addKeyListener(keyListener);
		typesViewer.initContextMenu(new IMenuListener() {
			public void menuAboutToShow(IMenuManager menu) {
				fillTypesViewerContextMenu(typesViewer, menu);
			}
		}, cotextHelpId,	getSite());
		typesViewer.addSelectionChangedListener(fSelectionChangedListener);
		typesViewer.setQualifiedTypeName(isShowQualifiedTypeNames());
	}
	
	private Control createMethodViewerControl(Composite parent) {