How does one change the size of holographic buttons?

I am referring to “HolographicButton” from “HoloToolkit”.

The prefab button is a square and I need a button which is broader than high. When I change the parent button by changing its Transform values, the text in the button gets stretched and I don’t want stretched text. Wenn I change the Transform settings from front and back plate the button in game view is sqare and only appears to be rectangular when selected.

How can I change the ratio of the button without changing the ratio of its text?

Answer is: change not only back and front plate but also Compound Button Mesh (Script)