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The solution is different depending if you use MVC or Web Forms. It's solved by adding hint for "full refresh":
MVC:
http://world.episerver.com/Documentation/Items/Developers-Guide/EPiServer-CMS/7/Content/Pages-and-Blocks/How-To/Edit-hints-in-MVC/
Web Forms
Add hint to PageBase property:
PageBase.EditHints.Add("IncludePublishDate");
and add FulllRefresh web control to page/master page:
<EPiServer:FullRefreshPropertiesMetaData runat="server" />
Is it possible to refresh the page in episerver UI on drop of a page/block in a content area? if so, any example?