Hi, to set the tooltip of a diagram shape you should modify its interactivity style:

NInteractivityStyle interactivityStyle = new NInteractivityStyle( "Tooltip Text" );
NStyle.SetInteractivityStyle(shape, interactivityStyle);

For more detailed information about interactivity styles, you can look at the following help topic: Interactivity Style and this KB article.

Best Regards,
Nevron Support Team

Does anyone know how to add a tool tip to an NShape? I didn't see it as a property. Can someone please help?