[Solved] UMG Child not stretching to fill horizontal box


I am trying to add 7 buttons to a horizontal box on widget construct by using Add Child node. The problem is that these buttons do not stretch to fill the whole horizontal box. If I add a button manually in the UMG I can set “Size” from “Auto” to “Fill” to stretch them but since I am adding these buttons on construct as children there is no way (that I know of) on how to make them fill the panel. I bet there is a simple solution to this… I have attached an image. Help is appreciated!