flag = .F.
FOR count  = 1 to thisform.activeSkillList.listcount
  IF thisform.existingSkills.Text == thisform.activeSkillList.list (count)
    flag = .T.
  ENDIF
ENDFOR
  
IF flag = .F.
  thisform.activeSkillList.AddItem (thisform.existingSkills.Text)
ENDIF