Dialog button bar positioning

Dialog button bar positioning

How do I position the button bar for the modal dialog at the top? 

I am using a dialog box with a form nested inside it.  The user can add new rows to the table in the form using a button.  As the user adds more rows, the buttons shift down to accommodate the new row.  I'd like to have the buttons at the top so they don't shift down with each new row.

I'm thinking I need to rework the CSS styling for ui-button-pane but I'm not sure how to proceed. 

Any recommendations would be extremely helpful.