I have a aspx page, with a modalpopup extender, and it's work perfect. But I place an Iframe on the end of the page, and the modelpopup work only when I click the button twice. I can't find the answer for this problem.
<asp:UpdatePanel ID="UpdatePanel4" runat="server">
<ContentTemplate>
<div class="szamlabal14">
Csatlakozási pont:
<input type="hidden" id="hdnCsatlakozasiPontKod" runat="server" value="0" />
<asp:TextBox ID="txtCsatlakozasiPont" runat="server" Width="480" onkeydown="return false;"></asp:TextBox>
<asp:Button ID="btnCsatlakozasiPont" runat="server" Text="..." />
<cc1:ModalPopupExtender ID="mpeCsatlakozasiPont" runat="server" CancelControlID="btnCancel"
TargetControlID="btnCsatlakozasiPont" OkControlID="btnOk" PopupControlID="pnPopup"
PopupDragHandleControlID="PopupHeader" Drag="true" BackgroundCssClass="modalBackground">
</cc1:ModalPopupExtender>
<asp:Panel ID="pnPopup" Style="display: none" runat="server">
<div class="modalPopup">
<div style="position: relative; left: 670; margin: 3px;">
<asp:Button ID="btnCancel" runat="server" Text="x" CausesValidation="false" OnClientClick="return false;" />
<asp:Button ID="btnOk" runat="server" Text="Ok" Style="display: none" CausesValidation="false"
OnClientClick="return false;" />
</div>
<iframe id="ifrCsatlakozasiPont" height="350px" width="700px" src="CsatlakozasiPont.aspx"
frameborder="1"></iframe>
</div>
</asp:Panel>
</div>
</ContentTemplate>
</asp:UpdatePanel>
When I delete the following part, the modalpopup work well again.
<div style="margin-top: 10px; z-index: 10; border: 1px solid black; position: absolute;
top: 130px;">
<iframe src="http://ismts38105/viewer/ImageViewer.xbap?<%=Image%> width="1440"
height="400" />
</div>
