I have this code:

                mmAppWPF.WindowManager.Show(new OutboundInvoiceReportViewer(invoicePKs), this);

                MessageBoxResult result = mmAppWPF.MessageBox.Show("Did all Invoices print successfully?",
                                       "Invoice Print",
                                       MessageBoxButton.YesNo,
                                       MessageBoxImage.Question);

Which displays the messagebox before the report has been displayed fully (just the outline of the form with the report viewer in it gets displayed).

This looks exactly like this code:

                mmAppWPF.WindowManager.ShowDialog(new InvoiceWithDetailReportViewer(manifestNumbers), this);

                MessageBoxResult result = mmAppWPF.MessageBox.Show("Did all Invoices print successfully?",
                   "Invoice Print",
                   MessageBoxButton.YesNo,
                   MessageBoxImage.Question);

which displays the form with the report viewer properly, then when I close the form the messagebox gets displayed. This is how I want it to work. Does anyone have any idea why the first set of code might work differently?