Programatically Creating Groups and setting as Associated Owners Group Client Object Model

Hi All,

I'm trying to create a subsite programatically from a Windows based Client and create non-inherited associated groups for the owner / members and visitors.

In effect - I *think* I'm wanting to create the equivalent of SPWeb.Groups as opposed to SPWeb.SiteGroups that I'd otherwise need in the Server Side world...

I Can create the site ... and groups ... but I'm struggling to set it as the default Owners / Visitors / Members group...

Any help gratefully appreciated....

ClientContext ctx = new ClientContext(ContextPath);
            WebCollection collWeb = ctx.Web.Webs;
            WebCreationInformation webCreationInfo = new WebCreationInformation();
            webCreationInfo.Title = strSiteTitle;
            webCreationInfo.Description = "Description of the new Web Site...";
            webCreationInfo.Language = 1033;
            webCreationInfo.Url = strURL;
            webCreationInfo.UseSamePermissionsAsParentSite = false;
            webCreationInfo.WebTemplate = "STS#0";
            Web oNewWebSite = collWeb.Add(webCreationInfo);
            ctx.ExecuteQuery();
GroupCreationInformation SPOwnersGroup = new GroupCreationInformation();
            SPOwnersGroup.Title = strSiteTitle + " Owners";
            SPOwnersGroup.Description = "Use this Group to grant people full control permissions to the SharePoint Site : " + strSiteTitle;
            Group groupo = ctx.Web.SiteGroups.Add(SPOwnersGroup);
            ctx.Web.AssociatedOwnerGroup = groupo;
            ctx.Web.AssociatedOwnerGroup.Update();
            groupo.Update();
ctx.ExecuteQuery();

Note - ContextPath, strSiteTitle and strURL are incoming parameters into my "CreateSite" function ...

I don't receive any errors when the above runs .... the group is created - but it doesn't seem to be the associated owner group.