/// <summary>
/// Safely disposes of several objects.
/// </summary>
public void Cleanup()
{
completionForm.FocusOutEvent -= OnLeaveCompletion;
completionView.ButtonPressEvent -= OnButtonPress;
completionView.KeyPressEvent -= OnContextListKeyDown;
completionView.KeyReleaseEvent -= OnKeyRelease;
if (completionForm.IsRealized)
{
completionForm.Cleanup();
}
completionView.Cleanup();
completionForm.Cleanup();
completionForm = null;
}