I am using Q2 2011 and this is exactly what I was looking for. Thank you very much for your tip!!!
However, after I did the changes I came across a few problems:
I have the pages where the comboboxes are located inside a table or inside a grid (RadGrid). And it looks like the style is not applied to the comboboxes at all (does not matter if it's custom skin or not). If I have a combobox on the page, the skin applied correctly. I attached the images.
2. When I open RadToolTip control or RadPanel control they look good and working correctly. However, I got the following error:
Error Caught in Application_Error event
Error in: http://localhost:61472/WebResource.axd?d=Kn23YQyCCBIGjWBdCIhaBka2xuxC_TsUzNvTRrXO9C4hbMgSP4quEvJtbziIZamQA2tq0UM3vj7V-WoMD14StQ0Sjl7hqiKcXFAnbC_10aZvRaLT-E_7Lt2yNta9E84bO_LVW_NhUTctCgusECUjCA_oV3ptpw4zFzEH4uqPttyNOu156gi_a062TqwUTtdxFfzQMg2&t=634650020430267417
Error Message: This is an invalid webresource request.
Stack Trace: at System.Web.Handlers.AssemblyResourceLoader.System.Web.IHttpHandler.ProcessRequest(HttpContext context)
at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)
Any suggestions why I had those problems?