Bug 10458 Support DND to set focus in Hierarchy View
Please enable Hierarchy view to support DND as a way to "focus on" something, whether it be a project, source folder, package, or type.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/typehierarchy/TypeHierarchyViewPart.java
return;
		IResource resource= null;
		try {
			resource= ((IJavaElement)element).getUnderlyingResource();	
		} catch(JavaModelException e) {
			
		}
		if (!(resource instanceof IFile))
			return; 
		
		MenuManager submenu= new MenuManager(TypeHierarchyMessages.getString("TypeHierarchyViewPart.menu.open")); 
		submenu.add(new OpenWithMenu(getSite().getPage(), (IFile) resource));
		
		menu.appendToGroup(IContextMenuConstants.GROUP_OPEN, submenu);
	}
	private void addOpenPerspectiveItem(IMenuManager menu, IStructuredSelection selection) {
		OpenTypeHierarchyUtil.addToMenu(getSite().getWorkbenchWindow(), menu, selection);
	}
	/**
	 * Toggles between the empty viewer page and the hierarchy
	 */
	private void setViewerVisibility(boolean showHierarchy) {
		if (showHierarchy) {
			fViewerbook.showPage(getCurrentViewer().getControl());
		} else {
			fViewerbook.showPage(fEmptyTypesViewer);
		}
	}
	
	/**