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I have moved your question to discussion forum. So it can be more visible to community members.

You could use the DspSetTip() cicode function for that. The trick is to call this function from one of the properties of the graphics object that allow a cicode expression.

I assume you would like to continuously update the tooltip with the current tag value. For this I usually create an expression in the 'Hidden When' property, because expressions in this property are processed each page scan. Your expression could look like this:

DspSetTip(DspGetAnCur(), MYTAG) AND FALSE

I will explain this expression:

- DspGetAnCur() retrieves the AN-number of the object, needed for DspSetTip() to set the tooltip of the correct object
- MYTAG is the name of the tag you would like to display the value of
- The addition of 'AND FALSE' ensures the expression always evaluates to FALSE, otherwise your object could become hidden in runtime

Disclaimer: I have not tested this myself, so please try it and report back.