private boolean containsAction(DockingActionIf action) {

		String name = action.getFullName(); // name and owner
		for (DockingActionIf existingAction : addedActions) {
			if (name.equals(existingAction.getFullName())) {
				return true;
			}
		}
		return false;
	}
Create and return a {@link VisualizationViewer} to display graphs
@return the new VisualizationViewer
Ghidra/Features/GraphServices/src/main/java/ghidra/graph/visualization/DefaultGraphDisplay.java