Here are a couple of links about the issues with detecting when a control is design mode (within Expression Blend or Visual Studio):
Second Stanza
Recent Posts- MVVM – MEF – Reactive Data Grid – Part IV
- MVVM – MEF – Reactive Data Grid – Part III
- MVVM – MEF – Reactive Data Grid – Part II
- MVVM – MEF – Reactive Data Grid – Part I
- WCF Client Functionality and Silverlight
- Sequential Asynchronous Workflows in Silverlight Using Rx Framework
- MissingMethodException and WaitOne
- Security Exception on Silverlight Client when Calling WCF Service
