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.
Or quoting the man page:
   '''grid anchor''' ''master'' ?''anchor''?:   The ''anchor'' value controls how to place the grid within the master when no row/column has any weight. See THE GRID ALGORITHM [http://www.tcl.tk/man/tcl8.5/TkCmd/grid.htm#M32] for further details. The default ''anchor'' is '''nw'''.

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 (once for each master).  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.

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