Many thanks Rich, that certainly works, my lack of lateral thinking on show right there.

But is this a workaround for a non functionality in the extension or is it by design ? Just seems odd that it works in one plane and not the other.

Sorry posted wrong door, try this one.

Door glass panelled.skp

Hello to all, after reading all 57 pages of this topic I have yet to find a solution to my issue with the box stretching function.

I have attached 3 images showing a simple paneled door that stretches all groups in the horizontal direction but only the frame in the vertical direction.

The door component consists of 11 different groups, What am I missing here ?