@Override
	protected void programActivated(Program program) {
		program.addListener(this);
		memManager.setProgram(program);
		provider.setProgram(program);
	}
Subclass should override this method if it is interested in
open program events.
Ghidra/Features/Base/src/main/java/ghidra/app/plugin/core/memory/MemoryMapPlugin.java