Grid with minimum height / visible row

Hi,

is there a way to define a minimum height / visible row for a grid ? 

I have e.g. a Grid with 3 elements, but I still see a lot of empty space beneath the elements. Is it possible to define a height/number of rows, so that, when the actual entries are smaller than this number, the grid is using only the height it is actually requiring (so no empty spaces) - and when the number of entries is higher, so scrolling comes into the game ?

If this is possible - then how ?

Thanks for any help