Setup a client side event at a DevExpress ASPxButton.

<dx:ASPxButton ID="Go" runat="server" AutoPostBack="false" Text="Go" >
</dx:ASPxButton>

 
 

What is above needs to become...

<dx:ASPxButton ID="Go" runat="server" AutoPostBack="false" Text="Go" >
   <ClientSideEvents Click="Whatever"></ClientSideEvents>
</dx:ASPxButton>