ActiveX Control's tool tip is not displayed when in a WindowsFormsHost

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WPF

ActiveX

We have a complex legacy ActiveX graph control that uses tooltips to display information when the cursor hovers over various areas of the graph. All of this works well when the control is hosted in MFC. We are now using WindowsFormsHost in WPF to display the graph and this is working well. All of the functionality we built into the control including events seems to be working well except that the tooltips are not being displayed. Are tooltip native to the ActiveX control expected to work normally?

In response to Sergey's comment my question is simply "Will a classic ActiveX control that displays a tooltip in a classic MFC application continue to display that tooltip in a WPF application when the control is hosted in a WindowsFormsHost?" If the answer to this is "Yes", I will be happy to include code so we can figure out what has gone wrong. For this question you can assume that the implementation follows Microsoft's guidelines at http://msdn.microsoft.com/en-us/library/ms742735.aspx[^] or examples from "WPF 4 Unleashed" by Adam Nathan.