Is it possible to add a button to an overlay class?

For example, I have an overlay class:
public class mymapoverlay extends Overlay {

Which is put over a map (in a map activity):
mapOverlay = new mymapoverlay(this);
moc = map.createOverlayController();
moc.add(mapOverlay, true);

To re-clarify my question....

It seems like you have done a lot of tutorials about drawing on an overlay over a map. But I havent seen an easy way to add widgets (Button, etc). Is there a way to draw a button on a canvas perhaps?

Ok. I found a way to do it. I call a subactivity and made a custom theme for that activity with a transparent background. This accomplishes the effect of a button over the map.