Pages 5.2 border under header / above footer

Question

Pages 5.2 now layouts the headers and footers as a 3 column box – for new documents at least. But how do I add a border under the header or above the footer?
If you select some text in the header, and add a border through the inspector, that border will only stretch to the width of the text node / string. What I want is adding a border that spans the whole width of the header.
(that 3 column layout box is actually a blessing for me right now, aside from the border issue…)

Answer 1

Add a line shape.
From the Help page:
Add and edit shapes
After you add a shape to a page, you can customise the shape in a number of ways. For example, you can change the standard five-point star into a twenty-point starburst, adjust how rounded the corners of a square are, add text inside a shape and more.
Add a shape
Click Shape in the toolbar.Click the arrows to see more shape styles.
Select a shape to add it to the page.