Is it possible to specify the size/position of tabs in an MFC MDI tabbed application?

I am trying to save the open tabs when exiting the program and restoring them when the application is relaunched. I have come up with a method of saving and reloading the tabs, but I cannot restore their position.

I have seen SaveMDIState and LoadMDIState but I can't make it do anything and I'm also not sure if it's what I need.

Thanks in advance,
AnotherMuggle