required=true dynamically set

<smartgwtVersion>3.1-p20140602</smartgwtVersion>
FF 24


Hi,

is it possible to set the required="true" dyniamically on the client and server side?

For example I have two fields in my *.ds.xml:

<field name="A" type="text" />

<field name="B" type="text" length="50" required="???"/>

If the field "A" has a value then field "B" shoud be requred=true on the client and server otherwise required=false?

I looked for some examples with requiredIfvalidator but there the functionality seems to focus only the client side.

Thanks for any help in advance,
zapryano