private void openView(String treeName) {
		TreeViewProvider provider = providerMap.get(treeName);
		if (provider != null) {
			viewManagerService.setCurrentViewProvider(treeName);
			currentProvider = provider;
		}
		else {
			provider = addTreeView(treeName);
			viewManagerService.setCurrentViewProvider(treeName);
		}
	}
Open an existing view in the program. If a provider already exists for
the given tree name, make this the current view provider in the view
manager service.

@param treeName name of tree
Ghidra/Features/Base/src/main/java/ghidra/app/plugin/core/programtree/ProgramTreePlugin.java