There probably a few ways you can accomplish this, depending on what exactly you're going for, one simple solution I can think of is by changing either the alpha property of the icon or the visibility property of the icon based on a timer, let's say you want to make the icon blink every so many milliseconds or every second.
The soon to be released versions of B4A, B4i and B4J include a new feature named: designer script extensions. The new feature allows calling B4X code from the visual designer scripts. Note that the B4X code is not executed at design time. I believe that over time this new feature, with a...