When your [grid]ded widgets don't take up all the space in a window, the '''grid anchor''' command allows you to say how they are arranged within the overall space.

Is there a way to change this so that the default revert to -anchor center instead of the 8.5 default of nw?  Yes, there is: ''catch {grid anchor $path center}'' before all your grid calls.  Yes, this can take ages.  No, there is no other way.  See TK bug 2062394 [http://sourceforge.net/tracker/index.php?func=detail&aid=2062394&group_id=12997&atid=112997] for reference.