/// <summary>
/// Opens new help window and brings it to focus
/// </summary>
public void OpenHelpWindow()
{
_helpWindow = HelpWindow.OpenHelpWindow();
_helpWindow.Show();
_helpWindow.Focus();
}
/// <summary>
/// Called when the Close button in the top right is pressed
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
public void WindowClosing(object sender, CancelEventArgs e)
{
_instance = null;
}