Set grid row height to 100%

Migrateduser

<p>Hello<br><br>
I would like to insert a grid with one row and this row must have the max height relative to the parent element.<br><br>
E.g., I have empty report: header, body and footer. And I insert 1x1 grid into the body. I set row height to 100%. I expect that row will occupy the all space between footer and header, but it doesn't happen.<br><br>
How do I set grid row height to 100%?</p>