Set Focus

 Hello,

I have a StringField, that looks like this:

hiCreateStringField(
                    ?name 'Test
                    ?prompt "Folder of Test File:.............................................."
                    ?value mvalue
                    ?invisible list(nil)
                    ?callback "checkDirEx( )"
                 )

 where my callback-routine looks like that:

 procedure(checkDirEx()
  prog(()
    
      if(!isDir(MyForm->Test->value) then
        if(hiDisplayAppDBox(
              ?name 'questMsgDBox
              ?dialogStyle 'modal     ; wait for user-interaction before continuing
               ?dboxBanner "Directory not found"
              ?dboxText sprintf(nil "Warning: the entered path does not exist.\nWould you like to change it?" )
              ?dialogType hicQuestionDialog
              ?buttonLayout 'YesNo)==t then    
            Test->focus=t

           )
    )
          
 
  )
)

Is there a way to set to Focus to a field?