Thanks for your quick response Andrew . I removed all the tags as recommended . This seemed to improve the problem but not solve completely . The info window was more stable but still sometimes only large enough to cover the content of the first tab ( which unfortunately smaller than the content of the second and third tabs ) .

Question: What may happen after I sent the message to Andrew ?
Answer: Andrew will cover the content .Andrew will make the info window smaller .Andrew will help me fix the problem .Andrew will remove all the tags .