When customizing a toolbar, a tried to create a button for Goal Seek by
dragging it from the menu to to the toolbar. At that point it disappeared
completely, appearing on neither the toolbar nor the menu. Using the "Reset
menu and toolbar usage data" button under customize has failed to bring it
back, and I have no way to use the Goal seek function now.

I created buttons in this way with the "Hide rows" menu choice successfully
in the past. Unfortunately, they have disappeared completely now as well
when I tried to use the "Reset menu and toolbar usage data" button. I cannot
hide rows as this action is completely gone (off the menu as well).
Aaaahhhh! Help! Thanks.