layout component disappear while the functions trigger
<p>my program contain date(fr/to) and a button. its to view report (2 charts and 1 datagrid). when the button is click system is able to generated the first chart and the data grid in the screen and 1 of the column of the datagrid is treat as the tab page group header(run time generated). and once user select the tab page header the second charts could be generated accordingly on bottom screen. but once the second chart is generated..  first chart and the entire tab page are disappear.. is it any thing related to my coding? 
button trigger:</p>

<pre><code>  private void second_load()
    {
        if (Page.IsPostBack)
        {
            Get_Parameter();
            Bind_Data();
            Bind_SummaryData();
            Gen_SummaryChart();

            Get_DistinctProduct();
        }
    }
</code></pre>

<p>Body:</p>

<pre><code>&lt;body&gt;
&lt;form id="form1" runat="server"&gt;

&lt;div id="parameter"&gt;
    &lt;asp:Label ID="lblDate" runat="server" Text="Date"&gt;&lt;/asp:Label&gt;
    &lt;br /&gt;
    &lt;asp:Label ID="lblDateFrom" runat="server" Text="From"&gt;&lt;/asp:Label&gt;
    &lt;asp:TextBox ID="txtDateFrom" 
        runat="server" 

        &gt;&lt;/asp:TextBox&gt;
    &lt;asp:CalendarExtender ID="txtDateFrom_CalendarExtender" runat="server" 
        TargetControlID="txtDateFrom" Format="dd/MM/yyyy"&gt;
    &lt;/asp:CalendarExtender&gt;
    &lt;asp:Label ID="lblDateTo" runat="server" Text="To"&gt;&lt;/asp:Label&gt;

    &lt;asp:TextBox ID="txtDateTo" runat="server"&gt;&lt;/asp:TextBox&gt;
    &lt;asp:CalendarExtender ID="txtDateTo_CalendarExtender" runat="server" 
        TargetControlID="txtDateTo" Format="dd/MM/yyyy"&gt;
    &lt;/asp:CalendarExtender&gt;

    &lt;asp:Label ID="lblType" runat="server" Text="Type"&gt;&lt;/asp:Label&gt;
    &lt;asp:DropDownList ID="dtpType" runat="server"&gt;
        &lt;asp:ListItem Value="%"&gt;Percentage&lt;/asp:ListItem&gt;
        &lt;asp:ListItem Value="q"&gt;Quantity&lt;/asp:ListItem&gt;
    &lt;/asp:DropDownList&gt;
&amp;nbsp;&lt;asp:Button ID="btnRetrieve" runat="server" onclick="btnRetrieve_Click" 
        Text="Retrieve" /&gt;
&lt;/div&gt;

 &lt;div id="container2" class="highcharts-container" 
     style="height:410px; margin: 0 2em; clear:both; min-width: 600px"&gt;
     &lt;/div&gt;
     &lt;br /&gt;

&lt;div&gt;

    &lt;asp:Button ID="Button1" runat="server" onclick="Button1_Click" Text="Button" /&gt;
    &lt;asp:ToolkitScriptManager ID="ToolkitScriptManager1" runat="server"&gt;
    &lt;/asp:ToolkitScriptManager&gt;
    &lt;br /&gt;
     &lt;div&gt;
     &lt;asp:TabContainer ID="TabC" runat="server" activetabindex="0"
     AutoPostBack="True" OnActiveTabChanged="TabC_ActiveTabChanged" /&gt;
     &lt;/div&gt;
     &lt;br /&gt;

     &lt;br /&gt;

    &lt;div id="container" class="highcharts-container" 
     style="height:410px; margin: 0 2em; clear:both; min-width: 600px"&gt;
     &lt;br /&gt;

 &lt;/div&gt;


    &lt;/br&gt;

&lt;/div&gt;
&lt;/form&gt;
</code></pre>

<p></p>
