Keyboard Layout Table – how to force update?

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http://askubuntu.com – After creating a custom keyboard layout, a table picturing the layout in a nice graphical representation was automatically created. It can be accessed from the keyboard icon. However, this table isn't updated after making chances to the already existing layout. This is annoying, since it doesn't display the actual keyboard layout. Deleting the layout from /usr/share/X11/xkb/symbols/ and re-creating it doesn't help; the table seems to be cashed somewhere. I have no idea where this picture (?) is saved, I don't even know what program creates it. Any idea how I can force this table to created (HowTos)