Action on textbox of ASP in different browsers

Hi:
I meet a problem about textbox in asp. If I hope to disable the "Enter" function 
for textbox, because the different browser like chrome will indeed create some unreasonable 
action, like call popupmodal to show, even not invoking that.
<asp:TextBox ID="txbTest" runat="server"></asp:TextBox> the upper is the code snippet. 
and it will call event when people key word in it and press enter. In IE, it will be no function, but in chrome
it will make the popupmodal controller to show up. How to fix that, thanks a lot