Query string is diappearing, when using MaskedEditExtender

I had a page, where parameters were passed through query string.

I decided to include MaskedEditExtender in this page.

<cc1:MaskedEditExtender ID="meeIP" runat="server"
TargetControlID="txbIP"
Mask="999.999.999.NNN"
MessageValidatorTip="true"

MaskType="None"
InputDirection="RightToLeft"

</cc1:MaskedEditExtender>

After this my query string disappeared.

I cannt get the value from query string.( Request["siteID"];)

But when I comment out the ajax control everething gets fine and my query string is visible again.

What should I do?

Its my first time, when I'm trying to use ajax.asp.net.

Help...

Help.

Help!

Does anybody has an answere?