Panel are not working proparly in the case of Visible True/False

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ASP.NET

Sir,

I take a panel in which i have textbox,ratio button,button,calender.
When page is loaded means first panel is False.
I have one button by which, when i click then Panel is ture.but it is not working.

See the Panel6


ASPX PAGE.
..........

<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False"  
        AllowSorting="True" AutoGenerateEditButton="false" 
        OnRowEditing="GridView1_RowEditing" 
        OnRowCancelingEdit="GridView1_RowCancelingEdit" 
        OnRowUpdating="GridView1_RowUpdating" 
        BorderColor="SaddleBrown" BorderStyle="None" CellPadding="4" 
        ForeColor="#333333" GridLines="None" PageSize="15" AllowPaging="True" ShowFooter="true">

            <columns>

            <asp:TemplateField HeaderText ="IDNO" Visible="false"><itemtemplate><asp:Label ID="lblid" runat ="server" Text ='<%#Eval("entry_id") %>' Visible="false" ></itemtemplate>

             

            <asp:TemplateField HeaderText="Item" ><itemtemplate> <%#Eval("item")%></itemtemplate>

            
            

             <asp:TemplateField HeaderText="Category" ><itemtemplate> <%#Eval("category")%></itemtemplate>

            
            
             <asp:TemplateField HeaderText="Unit" ><itemtemplate> <%#Eval("unit")%></itemtemplate>
             

            <asp:TemplateField HeaderText ="Revenue"><itemtemplate><asp:Label ID="lblid1" runat ="server" Text ='<%#Eval("rev") %>' ></itemtemplate>
                    
           
           

            <asp:TemplateField HeaderText ="Quantity"><itemtemplate><%#Eval("qty")%> </itemtemplate>

           <edititemtemplate>

           <asp:TextBox ID="textbox2" runat ="server" Text ='<%#Eval("qty") %>'>

           </edititemtemplate>

            
            <asp:TemplateField HeaderText="Amount" ><itemtemplate> <%#Eval("amount")%></itemtemplate>

            
            

             <asp:commandfield showeditbutton="True" ControlStyle-Width="50px" ControlStyle-Font-Bold="true" ControlStyle-Font-Underline="true" />
 

            </columns>

            <footerstyle font-bold="True" />

            <rowstyle backcolor="#FFFBD6" forecolor="#333333" />

            <SelectedRowStyle BackColor="" Font-Bold="True" ForeColor="Navy" />

            <pagerstyle horizontalalign="Center" cssclass="gvFooterRow" />

            <HeaderStyle BackColor="#7AB915" Font-Bold="True" ForeColor="White" />

            <alternatingrowstyle backcolor="#CCFF99" />

        
      <br />

    <asp:Panel ID="Panel1" runat="server" BackColor="#9CD73B" Width="300px">
     
    <asp:Panel ID="Panel2" runat="server" BackColor="#9CD73B" Width="300px">
    
    <asp:Panel ID="Panel3" runat="server" BackColor="#9CD73B" Width="300px">
    
    <asp:Panel ID="Panel4" runat="server" BackColor="#9CD73B" Width="300px">
    
    <asp:Panel ID="Panel5" runat="server" BackColor="#9CD73B" Width="300px">
    
   <asp:Button ID="Button4" runat="server" Text="Go For Deposite"  />  

<triggers>
<asp:AsyncPostBackTrigger ControlID = "GridView1" />
</triggers>



     

                
            
            <asp:Panel ID="Panel6" runat="server" Visible="false">
            
            <tr>
                <td>
                               <asp:Label 
                        ID="Label4" runat="server" Text="BR No." Visible="False" Font-Bold="True"><br />
                    <asp:TextBox ID="TextBox3" runat="server" Visible="False">
                </td>
                <td colspan="2">
                    <asp:Label ID="Label5" runat="server" Text="DATE" Visible="False" 
                        Font-Bold="True">
                    <br />
                    <asp:TextBox ID="TextBox4" runat="server" Visible="False">
                    <%--<asp:Button ID="Button2" runat="server" Text="..." Visible="False" />--%>
                    <asp:ImageButton ID="Button2" runat="server" ImageUrl="~/images/cal.gif" />
                     <asp:CalendarExtender ID="CalendarExtender2" runat="server" 

Enabled="True" PopupButtonID="Button2" TargetControlID="TextBox4" Format="dd/MM/yyyy">


                </td>
                <td colspan="2">
                    <asp:Label ID="Label6" runat="server" Text="Amount" Visible="False" 
                        Font-Bold="True">
                    <br />
                    <asp:TextBox ID="TextBox5" runat="server" Visible="False">
                 <asp:CheckBox ID="CheckBox1" runat="server" Text="Deposited" Visible="False" 
                        Font-Bold="True" ForeColor="#FF3300" />
                </td>
                <td>
                    <asp:Button ID="Button3" runat="server" Text="Submit" Visible="False" 
                        BackColor="#9CD73B" />
                </td>
            </tr>

CODE PAGE
.......

 Protected Sub Button4_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button4.Click

        Panel1.Visible = True
        Panel2.Visible = True
        Panel3.Visible = True
        Panel4.Visible = True
        Panel5.Visible = True
        Panel6.Visible = True

    End Sub
End Class