You could use a macro that would toggle checkmarks based on selection, double
clicking or rightclicking, but not just clicking.
But I like to just give the cell a custom format.
Format the cells by:
selecting them
format|cells|number tab|custom category
In the "type:" box, put this:
alt-0252;alt-0252;alt-0252;alt-0252
But hit and hold the alt key while you're typing the 0252 from the numeric
keypad.
It should look something like this when you're done.
ü;ü;ü;ü
(umlaut over the lower case u separated by semicolons)
And format that range of cells as Wingdings.
Now, no matter what you type (spacebar, x, anyoldtextatall), you'll see a check
mark.
Hit the delete key on the keyboard to clear the cell.
If you have to use that "checkmark" in later formulas:
=if(a1="","no checkmark","Yes checkmark")
You can just see if the cell is empty.
