How To Programatically Uncheck the Auto-Save Check Box in Prefab Edit Mode?

For a custom editor window I'm creating, I isolate a prefab by calling AssetDatabase.OpenAsset() and Instantiate gameobjects as children of that prefab using StageUtility.PlaceGameObjectInCurrentStage(). Now I only need those children temporarily to save their information such as rotation and position in a database, but with the auto-save check box checked, it overwrites the original prefab with the children in place. I believe that alternatively I can add the new children to a list and delete them from the parent when done editing, but I'm wondering if it's possible to just programtically uncheck the auto-save checkbox. Any help is greatly appreciated.