Change position of "answer dialog as sheet"

[Rolf Kocherhans]

Is it possible to change the location of an „answer dialog as sheet“ on OS X ?

I know that we can change the loc of a normal dialog box (preOpenStack), but can we
also do the same with a dialog box opened as sheet respectively a stack
opened as sheet ?

I would like to move the dialog box/stack down approx. 20 pixels because I
would like to use it in a stack with a custom window shape.

Otherwise I have to use groups :-(

Cheers
Rolf