In Forms 18.104.22.168, there is no limit in the number of characters (well within reason). The limitation is the horizontal space to the right. In other words, because the Tooltip will not word wrap, it will only display if it can fit to the right without going outside of the applet container space. As an option, you could count the number of characters in the string and for every X number of characters, insert a CHR(10). This will force the text to the next line. Now the limitation will be height. Meaning, you will need to use care not to push the text off the bottom of the applet. In which case, it would again not display.
Absolutely right. The buttons that don't show the tips that are closest to the edge of the form. Thanks.