Fixed Date Navigation in Calendar Screens

prs.desktop/Components/Calendar/Calendar.xaml.cs

@@ -785,7 +785,7 @@ namespace PRSDesktop
  
                 try
                 {
-                    Bookings.DisplayDate = Bookings.SelectedDate.Value;
+                    Bookings.DisplayDate = Bookings.SelectedDate.HasValue ? Bookings.SelectedDate.Value : StartDate;
                     Bookings.ItemsSource = appointments;
                 }
                 catch (Exception e)

prs.desktop/Panels/Jobs/JobSummaryGrid.cs

@@ -18,7 +18,8 @@ namespace PRSDesktop
                 DynamicGridOption.RecordCount,
                 DynamicGridOption.SelectColumns,
                 DynamicGridOption.FilterRows,
-                DynamicGridOption.ExportData
+                DynamicGridOption.ExportData,
+                DynamicGridOption.MultiSelect
             );
 
             HiddenColumns.Add(x => x.Product.ID);

prs.desktop/Panels/StockSummary/StockSummaryGrid.cs

@@ -32,7 +32,8 @@ namespace PRSDesktop
                 DynamicGridOption.RecordCount,
                 DynamicGridOption.SelectColumns,
                 DynamicGridOption.FilterRows,
-                DynamicGridOption.ExportData
+                DynamicGridOption.ExportData,
+                DynamicGridOption.MultiSelect
             );
             
             HiddenColumns.Add(x => x.Product.ID);