Bug 96952 [build path] project settings: library tab enablement and focus
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/wizards/buildpaths/LibrariesWorkbookPage.java
switch (index) {
		case IDX_ADDJAR: 
			libentries= openJarFileDialog(null);
			break;
		case IDX_ADDEXT: 
			libentries= openExtJarFileDialog(null);
			break;
		case IDX_ADDVAR: 
			libentries= openVariableSelectionDialog(null);
			break;
		case IDX_ADDLIB: 
			libentries= openContainerSelectionDialog(null);
			break;
		case IDX_ADDFOL: 
			libentries= openClassFolderDialog(null);
			break;			
		case IDX_EDIT: 
			editEntry();
			return;
		case IDX_REMOVE: 
			removeEntry();
			return;
		case IDX_REPLACE: 
			replaceJarFile();
			return;
		}
		if (libentries != null) {
			int nElementsChosen= libentries.length;					
			
			List cplist= fLibrariesList.getElements();