Creating child widget inside canvas panel problems

I’ve managed to get it to create, however the new widget doesn’t cover the space inside the canvas panel and is really small, I’ve tried everything I can think of but had no luck. Anyone know any solutions?

What type of root the child one has?

2015-01-07 02-05-32 NewWidgetBlueprint2 .png

And can u provide a screenshots of ur main widget and child

If you want to get the “fill” ability from widget, you need sort of layout widget to be the parent.