Richfaces Client Side Validation

I am using Richfaces Client side validation i am faceing problem that,
in <sf:clientNumberValidator regExp="[0-9]{10}" .....................etc

is not giving error after submitting form with less than 10 digit.

and if i add minLength="16" maxLength="16" attribute to this tag,

it shows error that this attribute is not present in Component Interface,
But i have seen some examples using this attribute.

What is the Catch here?

please help.

Thank you in advance.