CollapsiblePanelExtender Height Issue

Hi All,

I am facing this problem in couple of places in my project. I have one header panel and one content panel and I have placed CollapsiblePanelExtender on it it works fine if its collasped but doesn't show all the data or his genertaed div's height is fixed like 200px or something. Now if I collapse it and expand it again it works perfectly fine... 

Here is my code : 

<asp:Panel runat="server" ID="pnlFinancialBenefits" Visible="false"><!--#include file="../Common/PanelHeader2.inc"--><asp:Panel ID="pnlBenefits" CssClass="pnl_header_blue b_b" runat="server"><div style="cursor: pointer; vertical-align: middle;"><div class="f_l"><asp:Label ID="lblYearBenefits" runat="server" Text="Business Opportunity Summary"></asp:Label></div><div class="f_r arrow_pos"><asp:ImageButton ID="imgBtnBenefits" runat="server" CssClass="upArrow" AlternateText="(Show Details...)" /></div></div></asp:Panel><asp:Panel ID="dataPanelBenefits" runat="server" CssClass="contents_pnl" Height="0"><asp:Timer ID="TimerBenefits" runat="server" Interval="1" OnTick="TimerBenefits_Tick" /><div id="divLoadingBenefits" style="text-align: center;" runat="server"><asp:Image ID="Image1" runat="server" SkinID="loaderImageSkin"/></div><table id="tblBenefits" border="0" cellspacing="0" cellpadding="0" visible="false"
                                    runat="server"><tr><td align="left"><div style="height: 7px;"></div></td></tr><tr><td style="width: 100%"><ucSummary:ucSummary ID="ucSummary" runat="server" Visible="false" /></td></tr><tr><td align="left"><div style="height: 10px;"></div></td></tr></table><ajaxToolkit:CollapsiblePanelExtender ID="CPanelExtendBenefits" runat="Server" TargetControlID="dataPanelBenefits" ExpandedSize="0"
                                    ExpandControlID="pnlBenefits" CollapseControlID="pnlBenefits" ImageControlID="imgBtnBenefits"
                                    ExpandedText="(Hide Details...)" CollapsedText="(Show Details...)" ExpandedImage="../Images/up_normal.gif"
                                    CollapsedImage="../Images/down_normal.gif" Collapsed="False" SuppressPostBack="true" /></asp:Panel><!--#include file="../Common/PanelFooter2.inc"--></asp:Panel>

Any help will be much appriciated. 

Thanks,

Attiqe