/// <summary>
 /// Loads a query from disk
 /// </summary>
 private void LoadQuery()
 {
     using (OpenFileDialog diag = new OpenFileDialog())
     {
         diag.Filter = "xml Files (*.xml)|*.xml";
         if (diag.ShowDialog() == DialogResult.OK)
         {
             QueryObj = QuerySerilizer.LoadQuery(diag.FileName);
         }
     }
 }