public void rebuildDisplay(Program program, ProgramLocation programLocation,
			boolean maintainPerspective) {
		if (program == null || programLocation == null) {
			clear();
			return;
		}

		clearCacheForLocation(program, programLocation);
		model.reset();

		// record the view settings before performing the re-display
		GraphPerspectiveInfo<FGVertex, FGEdge> perspective = null;
		if (maintainPerspective) {
			perspective = getGraphPerspective(programLocation);
		}
		doDisplay(program, programLocation, perspective);
	}
Sets the message that will appear in the lower part of the graph.

@param message the message to display
Ghidra/Features/FunctionGraph/src/main/java/ghidra/app/plugin/core/functiongraph/mvc/FGController.java