I created a GroupedList, that has a header renderer containing a LayoutGroup in the ContentField.
Now the LayoutGroup contains a Label and a Button.
For this LayoutGroup I created a Horizontal Layout which should render the Button on the right side of the List. However the Header's width is still only a third of the ListWidth.
How do I set it to the Width of the GroupedList?
Ah, it seems I have found it: Adding
renderer.horizontalAlign = HorizontalAlign.JUSTIFY;
did the trick so far.