While creating some families this week I made a note to show a simple feature of circles that is extremely beneficial yet easily missed.  When using a circle in a parametric mass the circle may need to move with other items this can be accomplished by turning on the Center Mark Visible parameter. Selct an already drawn circle and in the properties check the “Center Mark Visible” option.

This will allow the align command to be used so that the center of the circle can now be locked to the Reference Planes or Lines.