multi-line-text-input-pane scroll bar

Hi all,

I am doing a gui interface for windows, mac os x and linux. But, I have a problem under linux, the scroll bar on the pane do not show up. This is only happening at linux, on win and mac is working properly. Here is a example or what I am doing:

(capi:contain (make-instance 'capi:multi-line-text-input-

pane
                                         :buttons :ok
                                         :vertical-scroll t
                                         :allows-newline-p t))

Any guess?

Thank you,

--
EDDY BAUTISTA