I am trying to close modelpopupextender using a button click, this button belongs to another form so modelpopupextender is not able to accessable.

I have tried to remove the updatepanel as suggested, but it's not working.

This is my form1.aspx (which includes a button, onclick which will display a ModalPopupExtender in which includes grid view)

<asp:Button id="btnclick" text="Show Modal Popup" runat="server" >

</asp:Button>

<cc1:ModalPopupExtender ID="ModelPopupExtender1" runat="server"

PopupControlID="pc" TargetControlID="btnclick" OkControlID ="Button2"

CancelControlID="Button1" BackgroundCssClass="bcc" BehaviorID="MPE1">

</cc1:ModalPopupExtender>

<asp:Panel ID="pc" runat="server" CssClass="pop" Style="display:none;">

<iframe style="width:1003px;height:550px;" id="if"src="EstPopUp.aspx" runat="server"></iframe>

</asp:Panel>

This is my EstPopUp.aspx ( Where gridview is dislpayed with save and cancel buttons)

<asp:GridView ID="gvContacts" runat="server" AutoGenerateColumns="false" CellPadding="5"  DataKeyNames="EstimateBreakUpTypeId" OnSelectedIndexChanged="gvContacts_SelectedIndexChanged" OnRowDataBound="gvContacts_RowDataBound" >

<Columns>

<asp:TemplateField HeaderText="DispOrder">

<ItemTemplate>

<center>

<asp:TextBox ID="TextBox1" width="20px" runat="server" Text='<%#

Bind("DispOrder") %>'></asp:TextBox>

</center>

</ItemTemplate>

</asp:TemplateField>

<asp:TemplateField HeaderText="EstBreakUpName">

<ItemTemplate>

<asp:DropDownList ID="DropDownList1" runat="server"  ></asp:DropDownList>

</ItemTemplate>

</asp:TemplateField>

<asp:TemplateField HeaderText="Percentage(%)">

<ItemTemplate>

<center>

<asp:TextBox ID="TextBox2" Width="30px" runat="server"></asp:TextBox>

</center>

</ItemTemplate>

</asp:TemplateField>

<asp:TemplateField HeaderText="Amount">

<ItemTemplate>

<asp:TextBox ID="TextBox3"  runat="server" CssClass="sum"  ></asp:TextBox>

<cc1:FilteredTextBoxExtender ID="fte" runat="server" Enabled="true"

TargetControlID="TextBox3" FilterType="Numbers,Custom" ValidChars=".">

</cc1:FilteredTextBoxExtender>

</ItemTemplate>

</asp:TemplateField>

</Columns>

</asp:GridView>

<br/>

<asp:Button ID="Button1" runat="server" Text="Save" OnClick="Button1_Click"></asp:Button>      

<asp:Button class="abc" ID="Button2" runat="server" Text="Cancel" CssClass=".cancel" OnClick="Button2_Click1"></asp:Button >

<br />

</asp:GridView>

My expected result is, when cancel button is clicked the modelpopup should disappear.