Jim,

>Hmmm.... I just created a vanilla Windows mmBusinessForm with no added code and put a plain mmButton on it with no added code. The only change was to add text to the ToolTipText property in the design window. I instantiate the form in my Windows app, click the button and the ToolTip goes away. I'm using MM v2.2. I don't know it is an MM problem, but since the only thing I touched was the ToolTipText on the mmButton, I thought I would start here.

You can try opening the mmTextHelper.cs file and setting a breakpoint in the SetToolTipText() method then run your application to see if anything unusual is going on.

Best Regards,