Hi,
>How can I set the TollTipText to the result of a memo field?
THISFORM.YourControl.ToolTipText = yourtable.yourmemo
But you should know that tooltips could only have a maximum length of 127 characters and were not able to display multiple lines in VFP versions prior to 8.0.
In 8.0 the limit for tooltips now is 4KB. If you're running VFP7 and want to overcome the given limits, you might consider using my anfoxgui.fll, which is available in the downloads section.
HTH,
Armin