/// <summary>
/// Provides a deterministic way to create the Main property.
/// </summary>
public void CreateMain()
{
if (_main == null)
{
_main = new MainViewModel();
}
}
/// <summary>
/// Provides a deterministic way to delete the Main property.
/// </summary>
public void ClearMain()
{
_main.Cleanup();
_main = null;
}