void enableActions(boolean enabled) {
		createAction.setEnabled(enabled);
		openAction.setEnabled(enabled);
		// toggle button is always enabled
	}
Read the data for the plugin upon deserialization; reads what should be
the current selection in the tree.
Ghidra/Features/Base/src/main/java/ghidra/app/plugin/core/programtree/ProgramTreePlugin.java