Created Unassigned: Designtime ServerBaseUri not set [99]

After upgrading to 4.5, when trying to modify my SL5 XAML views, I am getting a designtime error - "Could not use ServerBaseUri and the serviceUri to create an absolute Uri." It looks like for a workaround I should assign a ServerBaseUri in designtime, but I can't figure out what to use.

Any ideas on this?

```
public App()
{
if (DesignerProperties.IsInDesignTool)
{
DomainContext.DomainClientFactory = new WebDomainClientFactory()
{
//ServerBaseUri = Application.Current?.Host?.Source
//ServerBaseUri = new Uri(@"C:\Users\username\Source\Repos\appname\")
//ServerBaseUri = new Uri(Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location))
ServerBaseUri = new Uri("http://localhost:24711/", UriKind.Absolute), //debug setting
};
}

InitializeComponent();


```