Changing the Source Object of a Sub Form

I have a sub form called Child2 with the original Object source of Property2 and i would like to have a button that can change the Object Source as Customers2, how can i do this.

I have the Code

VB Code:

Child2.SourceObject=

But i dont know how to change it

i have tried

VB Code:

=Child2.SourceObject=Forms!Customers2

but that wont work, any ideas?

Thanks
iParadoX