docs: public void closeAllInfoWindows(){
  		for (Overlay overlay:mOverlayManager){
  			if (overlay instanceof FolderOverlay){
  				((FolderOverlay)overlay).closeAllInfoWindows();
  			} else if (overlay instanceof OverlayWithIW){
  				((OverlayWithIW)overlay).closeInfoWindow();
  			}
  		}
  	}