Adjust grid size to window size?

Question

Hello,
I am quite new to programming in C# and writing currently my first program using WPF.
At the moment I am struggling a bit with the grid. Is it possible to dynamically adjust the grid size to the size of the window (subtracting the borders of the window of course) so I could dynamically adjust sizes of objects inside the grid to its size?
Thanks already for any answer that might help me =S