Options for pack
-after=>$widget Places this widget after $widget.
-before=>$widget Places this widget before $widget.
-expand=>1 Allows widget to expand to fill unused space.
-expand=>0 Turns off expansion in filling unused space.
-fill=>x Fills widget out horizontally.
-fill=>y Fills widget out vertically.
-fill=>both Fills widget out both horizontally and vertically.
-side=>bottom Packs widget from bottom.
-side=>left Packs widget from left.
-side=>right Packs widget from right.
-side=>top Packs widget from top.