tab change lose url parameter

Dear All,



i open two tabs in tabpanel. so there are two links.

one is http://ift.tt/1FWL391

the other is http://ift.tt/1J67F4u,



first i am in this url(http://ift.tt/1J67F4u), but when i change to another tab. the url will be change as http://ift.tt/1FWL1OC not http://ift.tt/1J67GFx/123


it means i lost the parameter 123.



can anybody tell me why?



thansk.

tab change lose url parameter