Hi,

I've looked at you sample but if you looked at my picture, you will notice that the "tooltip" is part of xamgrdi itself, like a child of another row.

Hello Erika,

What I can suggest you in order to achieve your requirement is to use a child row to show your popup information.

I have modified the sample so that the row is expanded when a text inside the cell is clicked.

In this sample, each parent row has one child row, and a child band has only one TemplateColumn defined.
If you click a cell text for “Test2” column, the child row is displayed.

Let me know if I may be of further assistance.

Thank you,
Mihoko Kamiishi

Thanks for you help. 

Hello,

I'm glad you have resolved your issue.

If you have any other questions, please do not hesitate to ask.

Thank you,
Mihoko Kamiishi

thansk! I got it working already.

Hello Erika,

Thank you for your feedback.

As far as your Expander issue goes, I haven't been able to reproduce the problem you described on my side.

I have attached the sample project I used to test this.
Please test this on your environment and let me know if it works or not.

Please note that I removed the style "DetailsExpanderStyle" from Expander since I don't know how it's implemented on your end.

Thank you,
Mihoko Kamiishi