Control shift using tab button

Hi,

I am using html and active widgets to develop my web page.

problem is i am setting tabIndex for my html objects like textbox, checkbox, buttons etc.

but when i am using combo from widget i am not able to set tabindex for it.

so when i click tab keys and try to get to combo box, i never get to it.

please help.
Thanks

Please suggest me some solution, I need to implement it this weekend.
I am looking forward to your response.

Thanks