My accordion panel in markup:

<ajaxToolkit:Accordion 
ID="MyAccordion"
runat="server"
SelectedIndex="0"
HeaderCssClass="accordionHeader"
HeaderSelectedCssClass="accordionHeaderSelected"
ContentCssClass="accordionContent"
AutoSize="None"
FadeTransitions="true"
TransitionDuration="250"
FramesPerSecond="40"
RequireOpenedPane="false"
SuppressHeaderPostbacks="true">
<Panes>
    <ajaxToolkit:AccordionPane ID="AccordionPane10" runat="server">
        <Header>BBBBBBBBBB</Header>
        <Content>
        FFFFFFFF:<br /><br />
        <table cellpadding="0" cellspacing="0" width="750"><tr><td width="450" class="verificationtdleft">
            <asp:Image ID="step4_originalimage" runat="server" AlternateText="" />
        </td><td width="300">
            <asp:CheckBox ID="CB_Verification0" runat="server" AutoPostBack="true" /> Verify
        </td></tr>
        </table>
        </Content>

    </ajaxToolkit:AccordionPane>

    <ajaxToolkit:AccordionPane ID="AccordionPane11" runat="server">
        <Header>GGGGGGGGG</Header>
        <Content>
        HHHHHHHHHH:<br /><br />
            <table cellpadding="0" cellspacing="0" width="750"><tr><td width="450" class="verificationtdleft">
                <asp:Image ID="step4_image_thumbnail" runat="server" AlternateText="" />
            </td><td width="300">
                <asp:CheckBox ID="CB_Verification1" runat="server" AutoPostBack="true" /> Verify
            </td></tr>
            </table>
        </Content>
    </ajaxToolkit:AccordionPane>
</Panes>            

Here's how I handle the checkbox check:

Private Sub CB_Verification0_CheckedChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles CB_Verification0.CheckedChanged
    MyAccordion.SelectedIndex = 1
End Sub

I'm causing the panels to change correctly, it's just that they don't animate like they do when I click the headers. When I click the checkbox to change the panel, the panel just disappears instantly and the new one appears instantly, but I want it to be animated as if I clicked the headers. Is there a way to cause the animation to happen when force changing the visible panel?