private void BlockStringRadioButton_CheckedChanged(object sender, EventArgs e)
        {
            if (sender == Block1StringRadioButton)
            {
                m_currentStringBlock        = BlockType.Block1;
                Block1StringListBox.Visible = true;
                Block2StringListBox.Visible = false;
            }
            if (sender == Block2StringRadioButton)
            {
                m_currentStringBlock        = BlockType.Block2;
                Block1StringListBox.Visible = false;
                Block2StringListBox.Visible = true;
            }

            StringListBox.Focus();
        }
 public void OnActivate()
 {
     StringListBox.Focus();
     UpdateStringPreview();
 }