sounds like you used radio button, instead of checkbox

checkbox can be unchecked, but with a single radio button, you cannot uncheck it

所有跟帖： 

• how do i fix it? -qingshangdi66- ♀ (0 bytes) () 01/14/2010 postreply 19:01:15

• Google "Excel CheckBox" or "Excel RadioButton" -oops_yz- ♀ (0 bytes) () 01/14/2010 postreply 19:06:40

• toggle button: click it to turn it on;click it again to turn it -小学五年级- ♀ (172 bytes) () 01/14/2010 postreply 19:24:56