That's how I got it:
- Create an inherent uov_button from userobject
- Insert a datawindow into the uov_button
In the datawindow:
- Create a rounded rectangle with the size and color gradient you want. Apply your imagination :-)
- Create a rounded rectangle of equal size and transparent so that when you pass the cursor over it, it indicates that it has the focus.
- Add a computed field so you can code the tooltip
- Add a text object so you can code the text
In the uov_button
- Codes that when the cursor passes over the dw, the transparent rectangle is activated and when it exits, it is deactivated
- Encode to add the tooltip and text of the button

... the rest is up to you :-D

Here is my implementation, just as I described it to you but with images in the dw, as you see the cursor is on the second button.