@Override
	public void addAction(DockingActionIf action) {
		if (containsAction(action)) {
			Msg.warn(this,
				"Action with same name and owner already exixts in graph: " + action.getFullName());
			return;
		}

		addedActions.add(action);
		componentProvider.addLocalAction(action);
	}
Create and return a {@link VisualizationViewer} to display graphs
@return the new VisualizationViewer
Ghidra/Features/GraphServices/src/main/java/ghidra/graph/visualization/DefaultGraphDisplay.java