In order to make the usage of embedded Telerik skins even more transparent than before and reduce the size of the main Telerik AJAX assembly (Telerik.Web.UI.dll), we decided to introduce a separate dll for the AJAX skins (Telerik.Web.UI.Skins.dll) to attain both goals.
Update: Since Q3 2011, all existing skins, except Default, are moved to the skins assembly
. By doing so, we were able to shave few megs off the main assembly and transfer that load to the skins assembly. And though 6 megs might seem modest for some, it's some 40% reduction
in terms of the file size.: Separate Skin Assembly in RadControls for ASP.NET AJAX with Q3'11.
As it was mentioned four months
ago, all embedded skins (except the Default one, which will remain plugged in the Telerik.Web.UI.dll) will be shifted to the Telerik.Web.UI.Skins.dll and to utilize any embedded skin other than the Default skin, you will have to have a valid reference to the new AJAX skins dll in your project.
More information is available in these help articles: