OnClientClick for button still running even though in a Validation group
<p>I have a button that is in a validation group and when any of the textboxes on the page are not filled in the onClick wont run like it is suppose to but the OnClientClick will run.</p>

<pre><code> &lt;asp:Button ID="btnSend" runat="server" Text="Send" ValidationGroup="send" OnClick="sendNow"
    OnClientClick="document.getElementById('SendingMessage').style.visibility = 'visible'" /&gt;
</code></pre>

<p>Is there a way to stop the onclientclick from running like the onClick with the Validation group?</p>
