How to get the ID of the Message Window opened with ComposeMessage()

[Marcelle]

Hello,
I am using OEAPI version 3.2.3 and C++ on Windows Vista and Windows
Mail 6.0.
I open a new message window using ComposeMessage() and I want to get
the ID of the new Window using GetActiveMsgWndID():

m_oeapi->ComposeMessage();
long newMsgWndId = m_oeapi->GetActiveMsgWndID();

Instead of getting the ID of the new window I get the ID of the
message window of the currently selected message. But if I add the
Sleep() method to my code:

m_oeapi->ComposeMessage();
Sleep(500);
long newMsgWndId = m_oeapi->GetActiveMsgWndID();

I get the new window ID (the one I am looking for).
This solution doesn't satisfy me.
Is there another way to get the ID of the message window opened by
ComposeMessage()?

Regards,
Ewa Jajszczyk