Ajax Accordion Control issue

I am using Ajax accordion control on my .net project. It is always giving me vertical scroll bar regardless of autosize property. by default I used autosize="none" which didn't work. I have tried autosize other options which didn't help. I have set the limit of content to 100% which didn't work.

I am attaching my code and look forward to know the workaround.

<ajax:Accordion ID="Accordion1" runat="server" SelectedIndex="1"  HeaderCssClass="accordionHeader"
                            HeaderSelectedCssClass="accordionHeaderSelected"
                            ContentCssClass="accordionContent"
                            FadeTransitions="true"
                            SuppressHeaderPostbacks="true"
                            TransitionDuration="250"
                            FramesPerSecond="40"
                            RequireOpenedPane="false"
                            AutoSize="None"
                            Height="800px"
                            Width="100%"><Panes><ajax:AccordionPane ID="a3" runat="server"><Header> <a href="#" class="href">Release 3</a>   </Header><Content><div style="font-size:12pt; font-weight:bold; font-family:Arial;">
                            Release 3 Content</div></Content></ajax:AccordionPane><ajax:AccordionPane ID="a2" runat="server"><Header> <a href="#" class="href">Release 2</a>   </Header><Content><div style="font-size:12pt; font-weight:bold; font-family:Arial;">
                            Release 2 Content</div></Content></ajax:AccordionPane></Panes></ajax:Accordion>