public Element getRegroupVertexSettings(FunctionGraph functionGraph) {
		ObjectPropertyMap<SaveableXML> propertyMap =
			programUserData.getObjectProperty(FunctionGraphPlugin.class.getSimpleName(),
				REGROUP_SETTINGS_PROPERTY_NAME, SaveableXML.class, false);
		if (propertyMap == null) {
			return null;
		}

		FGVertex rootVertex = functionGraph.getRootVertex();
		Address entryPoint = rootVertex.getVertexAddress();
		SaveableXML saveableXML = propertyMap.get(entryPoint);
		if (saveableXML != null) {
			return saveableXML.getElement();
		}

		return null;
	}
A class to store user graph setting information, such as layout positions, grouping information
and vertex color information.

<P>Note: color information for a given address is stored using the {@link ColorizingService}.
This class will store color information for the vertex itself.
Ghidra/Features/FunctionGraph/src/main/java/ghidra/app/plugin/core/functiongraph/mvc/FunctionGraphVertexAttributes.java