public XapDownloadOperation(string xapUri, MefCompositionProvider compositionProvider)
 {
     _compositionProvider = compositionProvider;
     _tcs = new TaskCompletionSource<bool>();
     _xap = new DynamicXap(new Uri(xapUri, UriKind.Relative));
     _xap.Loaded += (s, args) => XapDownloadCompleted(args);
 }
 public XapDownloadOperation(string xapUri, MefCompositionProvider compositionProvider)
 {
     _compositionProvider = compositionProvider;
     _tcs         = new TaskCompletionSource <bool>();
     _xap         = new DynamicXap(new Uri(xapUri, UriKind.Relative));
     _xap.Loaded += (s, args) => XapDownloadCompleted(args);
 }