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I created a web-part using Telerik AJAX components. If I insert the web part in a sharepoint wiki page, the web-part is not shown. But if the wiki page is beeing saved with "save & close" the web-part will be shown regularly. Back to the edit mode the web-part is not shown. I debugged the web-part, but there is no exception thrown within. I looked in the html of the wiki page in edit mode and I find out that the output of the web-part is packed in following element:

<div id="ctl00_PlaceHolderMain_WikiField">
    <div id="ctl00_PlaceHolderMain_WikiField">
        <span dir="none">
            <div class="ms-rtestate-field ms-rtefield" style="border: none; ">
                <span id="ctl00_PlaceHolderMain_WikiField_ctl00_ctl00_TelerikScriptManager1"></span>
                <span id="ctl00_PlaceHolderMain_WikiField_ctl00_ctl00_originalEditorContainer" dir="ltr">
                    <input id="ctl00_PlaceHolderMain_WikiField_ctl00_ctl00_TextField_spSave" type="HIDDEN" name="ctl00$PlaceHolderMain$WikiField$ctl00$ctl00$TextField_spSave" value=" ... web-part html ... "/>

At Sites or WebPartPages the insertion and the editing works normal as expected. Any ideas?

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The webpart or any controls not visible in edit mode may be due to EditModePanel. You can check the wiki page layout in SharePoint designer and see if the webpart zone is in EditModePanel. The EditModePanel has property named PageDisplayMode which is Edit by default.

If PageDisplayMode=Display the content of EditModePanel appear only when the page is in display mode(and not in edit mode)

<PublishingWebControls:EditModePanel runat="server" PageDisplayMode="Display">

<!--The content here is not visible in edit mode-->

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I've not had this happen with the Telerik controls because I don't use those, but I have had this happen when trying to embed videos or anything else that has scripting or HTML in it into a Wiki type page. There is something in the type of page that prevents it from being stored or loaded properly. I have the exact same results you are experiencing. What I've had to do in the past is actually create a blank html page and embed the script or code there and then use the page viewer web part to show that page on the wiki-style editing page.

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Sounds complicated. Because my client want to use many wiki pages each with an own web part instance. – Ben Nov 10 '11 at 14:43

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