HtmlPage.RegisterScriptableObject() causes exception in Silverlight 4 User control

I get an exception in VS2010 designer when I use user control with code whic开发者_JAVA技巧h contains HtmlPage.RegisterScriptableObject() method. I've tried to move that code from control constructor to other methods but it doesn't help. I am using Silverliht 4.

Now I call HtmlPage.RegisterScriptableObject("MainPage", this) in UserControl_Loaded handler.

The exception message is

at System.Windows.Browser.ManagedObject.CreateHandle() at System.Windows.Browser.ManagedObject.GetObjectHandleAddRef() at System.Windows.Browser.HtmlPage.RegisterScriptableObject(String scriptKey, Object instance, Boolean isRestricted) at System.Windows.Browser.HtmlPage.RegisterScriptableObject(String scriptKey, Object instance) at SL_Form.forms.VT_kv_2010.UserControl_Loaded(Object sender, RoutedEventArgs e) in C:\SL2\SL_Form\forms\1VT_kv.xaml.cs:line 1533 at MS.Internal.CoreInvokeHandler.InvokeEventHandler(Int32 typeIndex, Delegate handlerDelegate, Object sender, Object args) at MS.Internal.JoltHelper.FireEvent(IntPtr unmanagedObj, IntPtr unmanagedObjArgs, Int32 argsTypeIndex, Int32 actualArgsTypeIndex, String eventName)

I can't use designer due to this bag. Although project builds without any errors and works fine. Any help will be appreciated.

John Smith

can you just put it inside an if not designer mode? that's (afaik) the typical approach for situations like this.

http://msdn.microsoft.com/en-us/library/system.componentmodel.designerproperties.isindesignmode%28v=VS.95%29.aspx