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copied!<p>Finally I found a workaround for my current problem.</p> <p>I'm still using the ClientScript.Resgister[...] but this time I also change the OnClientClick Javascript function of my cancel button. </p> <p>So when the guy select the feature "Save and Add New", when the page reload and the modal Show again if he click on Cancel I do a postback to the server just to reload the page and solve those weird behavior.</p> <p>I also think, the problem could exist because of the different Update Panel in my code, but I need them to make the Modal Popup Extender working. </p> <p>Anyway, I discovert that's it's not even working in Opera and Safari, but the Whole thing (Ajax Control toolkit - Modal popup extender). </p> <p>It's a chance the compagny here don't care about the other and support officially only IE. In my case, I wanna make it works at least in FF and Chrome too.</p> <pre><code>ClientScript.RegisterStartupScript(Page.GetType(), "ModalPopup", "Sys.Application.add_load(function() {ShowAddModalPopup(""" & Me.imgAdd.ID & """)});", True) btnCancel.OnClientClick = "resetDefaultValue();__doPostBack('" & btnCancel.ID & "','onclick')" </code></pre> <p>So there is the code, also in FF another error appear, </p> <p><strong>Sys.WebForms.PageRequestManagerServerErrorException: An unknown error occurred while processing the request on the server. The status code returned from the server was: 0</strong></p> <p>And I found this workarounf for it, it's not the best but I lost enought time with this...</p> <pre><code>ClientScript.RegisterStartupScript(Page.GetType(), "WorkAroundFF", "Sys.WebForms.PageRequestManager.getInstance().add_endRequest(endRequest); function endRequest(sender, args) { /* Check to see if there's an error on this request.*/ if (args.get_error() != undefined) { $get('Error').style.visibility = ""visible""; /* Let the framework know that the error is handled, so it doesn't throw the JavaScript*/ alert. args.set_errorHandled(true); } }", True) </code></pre> <p>So thx for your help Ramesh, i'm pretty sure your solution would work if it was not my Update Panels.</p> <p>Hope that could help someone else.</p>

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