combobox tabindex problem

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C#

ASP.NET

combobox

Hello to all,

I am using an ajax combobox for auto complete property,
I set a tab index to all of the controls on my form.

When I type text in the combobox and press the tab key, the focus is not moving directly onto another control.
First it moves onto the combobox down button, then in second key press it moves to another control.

How can I fix this?
Any suggestions?

Thanks
Karthik