problem with "XStream Out" using skill command

  Hello everyone, 

       I try to set some of the setings from the "Geometry" tab of the X Stream Out form using skill commands, but they don't work!?

       For example I try to set this

                xstSetField("rectToBox" "true") 

           the returned value is t, but the check box is still unchecked .This happens when I try to setup and the other check boxes ( export settings) from this tab.

     Am I wrong with the commands, or there is a bug?

  Regars,

      Nikolay