Wpf Disposition

How do i specify to my button that he will be align with the middle of my datagrid even if my datagrid move when resize ?

HorizontalAllignment="Center"

yup but it will center with the grid and not with my datagrid no ?

yes

but you can have it be in the same column as the datagrid

or create another grid for the datagrid and the button

ok i will do that thanks