Thanks for your reply, I could hardly get it all.
I mean the main view is not showing up, I am using MEF .. whenever I have error in any
particular thing in the page it doesn't show up... I can deal with this no problem.
I debug the application and the detailsRegionManager is not assigned (null), what do you mean by register the detailsRegionManager ... I don't get it
Where should I register the detailsRegionManager ?
could you please clarify if my previous
steps are correct and then update it to register the detailsRegionManager with MEF.
Appreciate your help indeed