>>>>Is it possible to force only numeric values on inputbox command?
>>>
>>>Set InputMask to something like "99999.99"
>>
>>I mean INPUTBOX() command. How to set inputmask?
>
>According to the help (I am looking at version 8), it doesn't seem to have any such option. InputMask is not supported, and the default value has to be of type character.
>
>I suggest you create your own function, which you might call NumericInput(), where you can provide all the functionality you want. You can use a custom form with a TextBox for this purpose.

Check Download section here. I believe, there should be two inputbox classes: by Rick Borup and by Mike Helland.