private void clearCacheForProgram(Program program) {
		for (Function function : cache.asMap().keySet()) {
			Program functionProgram = function.getProgram();
			if (functionProgram == program) {
				cache.invalidate(function);
			}
		}
	}
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