How to set Grid layout so that it expand downward when we add new elements.

I'm working on grid layout with content size fitter
I'm adding the buttons on grid layout in Runtime.
When buttons are added on run time the container start growing from both sides up and down.
And I show a middle part of container

What I want is

The container should expand only down side

Before play there is no buttons


I'm getting like this


I want like this


So Is there Any way to fix this problem
Plz help me

 

You need to change the pivot on the transform of the object with the grid layout group.

 

@KaHeer Thanks!