How to stop flickering model popup on mouseover in calendar control in asp.net

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C#

ASP.NET

Javascript

Ajax

C#4.0

Hi All,

I am using ajax model popup extender to show the popup on date cell in calendar control in asp.net using c#.

When I do mouse over on the date cell popup is blinking.
Please help to resolve this issue. Thank in advance.
Below is the code:

<script language="javascript" type="text/javascript">

        function ShowModalPopup() {
            $find("ModalBehaviour").show();
        }

        function HideModalPopup() {
            $find("ModalBehaviour").hide();
        }

    </script>

<asp:Panel ID="Panel1" runat="server" Style="display: none;">
        <div>
            <table border="1">
                <tr>
                    <td>
                        Case Hearing:
                    </td>
                    <td>
                        <asp:Label ID="hylCaseHearing" Text="1" runat="server"></asp:Label>
                    </td>
                </tr>
                <tr>
                    <td>
                        Notice Reply:
                    </td>
                    <td>
                        <asp:Label ID="hylNoticeReply" Text="2" runat="server"></asp:Label>
                    </td>
                </tr>
                <tr>
                    <td>
                        Contract Expiry:
                    </td>
                    <td>
                        <asp:Label ID="hylContractExpire" Text="3" runat="server"></asp:Label>
                    </td>
                </tr>
                <tr>
                    <td>
                        IPR Expiry:
                    </td>
                    <td>
                        <asp:Label ID="hplIPRExpire" Text="4" runat="server"></asp:Label>
                    </td>
                </tr>
            </table>
            <asp:HiddenField ID="hdntest" runat="server" />
        </div>
    </asp:Panel>
    <asp:Button ID="btn1" OnClick="btn1_Click" runat="server" Style="display: none" />
    <cc1:ModalPopupExtender PopupControlID="Panel1" TargetControlID="Panel1" ID="ModalPopupExtender1"
        BehaviorID="ModalBehaviour" runat="server">
    </cc1:ModalPopupExtender>

Code Behind Code

e.Cell.Attributes.Add("onMouseOver", "javascript:ShowModalPopup();");
e.Cell.Attributes.Add("onMouseOut", "javascript:HideModalPopup();");