Menu items:
- Align left: Align selected Pmg objects to the left edge of active Pmg object
- Align right: Align selected Pmg objects to the right edge of active Pmg object
- Align up: Align selected Pmg objects to the upper edge of active Pmg object
- Align down: Align selected Pmg objects to the bottom edge of active Pmg object
- Center horizontally: Moves selected Pmg objects so the X coordinates of their centers match the X coordinate of the center of active Pmg object
- Center vertically: Moves selected Pmg objects so the Y coordinates of their centers match the Y coordinate of the center of active Pmg object
- Unify horizontal spaces: Moves selected Pmg objects so the horizontal spaces between them are identical
- Unify vertical spaces: Moves selected Pmg objects so the vertical spaces between them are identical
- Unify widths: Change the size of selected Pmg objects so their width matches the width of active Pmg object
- Unify heihghts: Change the size of selected Pmg objects so their height matches the height of active Pmg object
- Unify widths and heights: Change the size of selected Pmg objects so their height and width match the height and width of active Pmg object