Here is an example of displaying Tooltips only when data goes beyond the length of the column.

https://drive.google.com/open?id=0B6J5FirdQZquYXI0QnFWdWJabjQ

To get the latest version of the full example app Eduardo posted, go here:

http://www.topwizprogramming.com/freecode_dwgridxp.html

Basically it calls the function in a loop after retrieve is done rather than as each row comes in.

I hope to help you. In the following URL look for the function: of_resizewidth, that's how I use it.

http://pbminer.dwox.com/Sources/TopWiz/dwgridxp/PB8/n_svc_dw_gridstyle.sru

One more thing: Coding in retrieverow event is bad for performance. You should calculate the text size after retrieve.

Hi Ricardo,

good idea to make tooltip only available if ellipsis is showing. I had the same idea but found no solution.

BTW: You should use GetTextExtentPoint32W instead of GetTextExtentPoint32A.