Tweaked InvoicePanel Sizing

prs.desktop/Panels/Invoices/InvoicePanel.xaml

@@ -8,7 +8,7 @@
              mc:Ignorable="d"
              d:DesignHeight="600" d:DesignWidth="800">
     <dynamicGrid:DynamicSplitPanel 
-        Anchor="Master" 
+        Anchor="Detail" 
         AnchorWidth="450" 
         View="Combined" 
         AllowableViews="Combined, Master"