Antonio, there is a simple way to achieve a similar effect with just one annotation and two attributes sets - one showing only the icon as an annotation background image and no frame, the other showing the annotation frame and text with the background image in the upper left corner for instance.
It would not show the icon and the annotation pointing to it though, but would provide a simple and somewhat more elegant approach - the icon 'morphs' into an annotation and back.
To change an annotation appearance, just swap its attributes.
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