title: Adding items to combobox itemsource
body: <p>I am binding a data table to combobox like as i show in code below .</p>
  
  <pre><code>        objComboBox.ItemsSource = objDataTableNew.DefaultView;
          objComboBox.DisplayMemberPath = objDataTableNew.Columns[0].ToString();
          objComboBox.SelectedValuePath = objDataTableNew.Columns[1].ToString();
          objComboBox.SelectedIndex = 0;
  </code></pre>
  
  <p>Now i want to add combo box item with display text as "select" and value as "-1" to the top of the list . 
  Directly i cant add since itemsource is bound with data table.
  I tried inserting a row to objDataTableNew at index zero . but i am having a prob . 0th column of datatable obtained from DB is a integer column. So i cant insert a string value "select" to that column .</p>
  
  <p>How do i achieve this ?</p>