Regarding font- It may happens because the font available in Mac are not available in windows. So either you have to embed that font or use other font
which are supported in both.
Regarding Tabbar, you can explcitly specify height and weight so there will be no problem..
Thanks a lot for your help buddy...I've embedded the file and now it's working fine..
One more question
I've just started learning Flex 4, I've finished watching videos of Flex In A Week...which book do you suggest for further learning Flex 4???
Thanks a lot for your help buddy....