RequireComponent from EditorWindow in Custom Editor?

Hello there.

I'm in the middle of scripting a custom window for my game project.

I have 2 scritps.

CustomWindow.cs <-- This being a custom window
&&
CustomEditor.cs <-- This being a custom editor.

In the editor script using void OnSceneGUI; in order to cast rays to the suface, as well as instantiate objects on the surface.

Now I would like the object to be defined in the custom Window. I have the ObjectField working correctly.

Is there a way I could possibly require a component of...

RequireComponent from EditorWindow in Custom Editor?