After I have red this: Custom Info Window for Google Maps
and watched the video: http://www.youtube.com/watch?v=ILiBXYscsyY
having in mind (from SDK documentaiton):
Note: The info window is rendered as an image each time it is displayed on the map. This means that any changes to its properties while it is active will not be immediately visible. The contents of the info window will be refreshed the next time that it is displayed.
i will probbably go for self-made info window basing very much on tutorial from mentioned video.