How to create a scroll box with 2 columns

[Javad_Rezaii]

Hi guys I want to make a scroll box with 2 columns.
Like so:

Here someone said its possible with using a grid inside of a scroll box.
But its not!
That way will change the size of my buttons. which is not that I want.
I want my buttons to be so big, so the second row would not be visible completely without scrolling.
Thanks.

[Javad_Rezaii]

I have managed to fix the problem by changing the value of Min Desired Slot Height of the my Uniform Grid Panel.