Dialog box tooltips: how to show on disabled control

I need to be able to show a tooltip to a disabled control. I call the Create() function like so:
m_ToolTips.Create(this, TTS_ALWAYSTIP);
The tooltips to enabled buttons show up fine in the dialog, but the tooltips on a diabled button never show up.
Any ideas?

Thanks in advance,
Ernie Richmond
ernie@vidcad.com