Add ScriptableObject to collection upon creation

Hey guys! I've been working on an editor extension for creating and editing ScriptableObjects, but I also have the option to create ScriptableObjects by Create-> ScriptableObject and poof, there's an asset. My question is: How do I make sure that when I use the Create menu to create ScriptableObjects, that the object gets added to my collection? Best regards Kenneth 'Light' Berle