title: Keypress event in cell of datagridview with key return
body: <p>Code run when I use with key A.
  But code not run when I use with key return.</p>
  
  <pre><code>    void dataGridView1_EditingControlShowing(object sender, DataGridViewEditingControlShowingEventArgs e)
      {
          TextBox txt = e.Control as TextBox;
          txt.KeyPress += new KeyPressEventHandler(txt_KeyPress);
      }
  
      void txt_KeyPress(object sender, KeyPressEventArgs e)
      {
          /* Code run. */
          if(e.KeyChar == (char)Keys.A)
          {
              MessageBox.Show("Hello");
          }
  
          /* Code not run! */
          if (e.KeyChar == (char)Keys.Return)
          {
              MessageBox.Show("Hello");
          }
      }
  </code></pre>
  
  <p>But it run if I try with a text box.</p>