Windows UserControl Hosted in IE Will Not Display Tooltips

[tony]

I have a Windows Forms UserControl that runs in a thick client. I am
now deploying it within an IE web page. Everything works fine,
including events, except for one feature. As the mouse is moved across
the control, a System.Windows.Forms.Tooltip is used within the control
to display information to the user about what is under the mouse. It
works fine in the thick client but does not display in the web version.

Previously, our control was ActiveX and the tooltip worked fine in both
thick and browser clients. Any assistance would be appreciated.

Thanks.