public void Clear()
{
UIHelper.SetText(m_usernameTextBox, String.Empty);
UIHelper.SetText(m_passwordTextBox, String.Empty);
UIHelper.SetText(m_loginError, String.Empty);
UIHelper.SetText(m_impersonateUsernameTextBox, String.Empty);
UIHelper.SetVisibility(m_impersonateCanvas, Visibility.Collapsed);
}