TextBox Focus Lost when using AJAX UpdatePanel

[Guest]

Hi,

I have a series of textboxes on an aspx page.

These textboxes are within an UpdatePanel.

On the OnTextChanged Event of each textbox I do some calculations in my
codebehind and update some Textboxes with total values.

However, on the OnTextChanged Event the focus is lost i.e. when my user
tabs out of textbox 1 and I do some calculations the focus is lost from
textbox2.

Anyone know how I can overcome this?

Thanks in Advance.