public override void onItemClick <T1>(AdapterView <T1> parent, View view, int position, long id)
 {
     if (files[position].Directory)
     {
         updateFileList(files[position]);
     }
     else
     {
         view.Selected    = true;
         okButton.Enabled = true;
         filePath         = files[position].AbsolutePath;
     }
 }