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OOB People search result web part uses control SEARCHWC:PopupControlExtender for displaying recent content created by the user. How can I use that control in custom code? If I add the control in custom code, I get error

Unknown server tag 'SEARCHWC:PopupControlExtender'.

What reference should I have in my .master page to get this working? Thanks!

Also SEARCHWC:PeopleCoreResultPopupControl seems to be used on the OOB Web Part.

UPDATE: According to reflector PopupControlExtender is found from Microsoft.Office.Server.Search.WebControls, still this doesn't do any good

<%@ Register Tagprefix="SEARCHWC" Namespace="Microsoft.Office.Server.Search.WebControls" Assembly="Microsoft.Office.Server.Search, Version=, Culture=neutral, PublicKeyToken=71e9bce111e9429c" %>
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You should specify the tag declaration on your page

<%@ Register TagPrefix="tagPrefixName" Namespace="namespace" Assembly="fullAssemblyName" %>


<%@ Register TagPrefix="tagPrefixName" TagName="tagName" src="pathToTheControl" %>

Could you look at the working page that contains SEARCHWC:PopupControlExtender and copy past the registration which contains TagPrefix="SEARCHWC" ?

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If I add OOB People Search Results Web Part on my page, it contains SEARCHWC:PopupControlExtender, yet I cannot find any reference to it anywhere. That OOB web part on the same page with my custom web part, will work just fine with that SEARCHWC:PopupControlExtender control. – Jussi Palo Mar 28 '12 at 12:57
try to use <%@ Register TagPrefix="SEARCHWC" Namespace="Microsoft.Office.Server.Search.WebControls" Assembly="Microsoft.Office.Server.Search, Version=, Culture=neutral, PublicKeyToken=71e9bce111e9429c" %>, but I'm not sure that it is a control that you use :) – Alexander Mar 28 '12 at 13:15
Thanks, just looked that up using reflector and tried, but it doesn't help. Strange. – Jussi Palo Mar 28 '12 at 13:16
Look at this post... may be it will be helpfull. – Alexander Mar 28 '12 at 13:20
Unfortunately that post doesn't discuss my issue, although on the post there you can see the SEARCHWC control just like it is on OOB search results web part. – Jussi Palo Mar 28 '12 at 13:22

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