Anchor a button to bottom right of cell?

[bigroups]

I have added a button (Developer->Insert-Button (Form Control)) to the right side of a cell. The button's 'Format Control'->'Properties' is set to 'Move but don't size with cells'. When I narrow the width of the cell, the button extends over the edge of the cell. This is due to the fact that the button is anchored to the Top Left corner of the cell. I want the button to remain on the right hand side of the cell and therefore be anchored to the Bottom Right corner of the cell.

Is it possible to change the anchor point of a button?