Ajax calendar not displaying properly inside the gridview

In my grid contain one ajax calendar when i click on that it showing a extra space.I don't want that how to fix this error.I am facing the same issue check this http://forums.asp.net/t/1464064.aspx?Calendar+control+resting+in+a+grid+view  also in my grid contain two scrolls down and side.

In my grid view code..

<div id="OverFlowDiv" runat="server" ><aspx:ExtendedGridView ID="GridViewActions" runat="server" OnPageIndexChanging="GridViewActions_OnPageIndexChanging" OnSorting="GridViewActions_Sorting"
                    OnPageSizeChanged="GridViewActions_OnPageSizeChanged" style="position:relative;" OnRowDataBound="GridViewActions_OnItemDataBound" Scrollbar="Horizontal" Visible="false"
                    Width="980px"><asp:TemplateField HeaderText="Completed Date" SortExpression="ActionCompletedDate"><ItemTemplate><%--  <telerik:raddatepicker id="completedDate" runat="server" mindate="1/1/1900" skin="Vista"
                                    width="110px" enabletyping="false" autopostback="true" onselecteddatechanged="completedDate_SelectedDateChanged"><Calendar ID="Calendar1" runat="server"></Calendar></telerik:raddatepicker>--%><asp:UpdatePanel ID="completedDateUpdatePanel" runat="server"><ContentTemplate><asp:TextBox runat="server" ID="completedDateText" AutoPostBack="true" OnTextChanged="completedDate_SelectedDateChanged"
                                            Style="width: 73px;" /><input runat="server"
                                                type="image" id="completedDateImg" src="www.asp.net.com" style="margin:-7px 0" class="Calender" value=" "/><ajaxToolkit:CalendarExtender ID="completedDate" runat="server" TargetControlID="completedDateText" OnClientDateSelectionChanged="dateSelectionChanged"
                                            StartDate="01/01/1990" CssClass="cal_Theme3 cal_Theme1" PopupButtonID="completedDateImg" OnClientShowing="clientShowing"></ajaxToolkit:CalendarExtender></ContentTemplate></asp:UpdatePanel><asp:HiddenField ID="hfCompletedDate" runat="server" Value='<%# Eval("ActionCompletedDate", "{0:MM/dd/yyyy}") %>' /></ItemTemplate><ItemStyle HorizontalAlign="Left" Wrap="false" /><HeaderStyle Width="126px" HorizontalAlign="Left" /></asp:TemplateField></div>

Adding dynamic div..

<div id="ctl00_ContentPlaceHolder1_GridViewActions_div" style="padding-bottom:5px;overflow-x:scroll;overflow-y:hidden;width:980px;max-height:auto;height:auto;">

// gridview code

</div>