[Trinidad] How to right-align numbers in tr:column

[Renzo Tomaselli]

Hi, Trinidad tag documentation states that the column component should 
have a formatType attribute.
I tried to right-align a numeric cell as <tr:column formatType="right">, 
but I got the warning "Property 'formatType' is not on type 
org.apache.myfaces.trinidad.component.core.data.CoreColumn"
How can I do align numeric columns ?