private ToggleDockingAction getPreviewWindowAction() {
		if (previewWindowAction == null) {
			previewWindowAction = new PreviewWindowAction(plugin, this);
		}
		return previewWindowAction;
	}
This creates all the actions for opening/creating data type archives.
It also creates the action for refreshing the built-in data types
from the class path.
Ghidra/Features/Base/src/main/java/ghidra/app/plugin/core/datamgr/DataTypesProvider.java