Hi,
 
excuse for my bad english.

> With this reference i think to have the input set to   relative 
> descriptionKey.

>
>I can only guess:
>
>html textInput
>     value: (aDescription toString: (object readUsing: aDescription));
>    callback: [ :value |  object write: (aDescription fromString: 
> value) using: aDescription ].
 
i work with your guess, and some thing go other no.
 
I'have problem with description define using MANumberDescription new ....
 
When, in the textInput digit an char the method  visitNumberDescription: aDescription go in error.
.
And if description is define with addCondition, this are not tested at callback:..
 
 
 
Another  problem about MANumberDescription :
 
    in description based on it, if i define beInteger or min: or max:
    when digit an chart in the UI the method  visitNumberDescription: aDescription go in error.
 
Thank,
 
Dario