How do I add lines to multicolumn listbox control

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  I did once, like this:

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  scriptEffect.xml =
  
      
          
          
      
      
          
          
          
      
  ;
  scriptEffect.matchName = [email protected]();
  
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      var ret;
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      XML.setSettings(XML.defaultSettings());
  
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          file.open("r");
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          idx = str.indexOf("");
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          header = str.substring(0, idx-1);
          xml = new XML(str.substring(idx, str.length));
  
          if (!xml.contains(scriptEffect.xml)){
              xml.appendChild(scriptEffect.xml);
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              file.open("w");
              if (!file.write(header + xml.toXMLString())) {file.close(); throw "ERR_WRITE_FAILED";};
              file.close();
              alert("Preset installed succesfully. Please restart After Effects");
              }
          else{
              alert("Preset already installed. You need to restart After Effects to make it effective.");
              };
          ret = true;
          }
      catch(e){
          file.close();
          alert(e);
          ret = false;
          };
  
      XML.setSettings(xmlSettings);
  
      return ret;
      };
  

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