public void showFormatChooser() {
		FGVertex vertex = view.getFocusedVertex();
		if (vertex == null) {
			vertex = view.getEntryPointVertex();
		}

		PluginTool tool = plugin.getTool();
		SetFormatDialogComponentProvider setFormatDialog =
			new SetFormatDialogComponentProvider(getDefaultFormatManager(), minimalFormatManager,
				tool, provider.getProgram(), vertex.getAddresses());
		tool.showDialog(setFormatDialog);
		FormatManager newFormatManager = setFormatDialog.getNewFormatManager();
		if (newFormatManager == null) {
			return;
		}

		SaveState saveState = new SaveState();
		newFormatManager.saveState(saveState);
		minimalFormatManager.readState(saveState);
		plugin.setUserDefinedFormat(minimalFormatManager);
		view.repaint();
	}
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