Force a page or line break
Force a page or line break by setting the X-size or Y-size property to "rest".
To force a page break, insert a container in the page at the point you want to break.
To force a line break, insert a container in the stripe at the point you want to break.
If the container has a vertical layout direction, set the Y-size property (width) to rest. If the container has a horizontal layout direction, set the X-size property (height) to rest. The container then stretches to fill the remaining space in the appropriate direction.