Added back in ability to create, edit and delete bills

prs.desktop/Panels/Suppliers/Bills/SupplierBills.cs

@@ -39,7 +39,6 @@ namespace PRSDesktop
 
             options
                 .BeginUpdate()
-                .Clear()
                 .Add(DynamicGridOption.FilterRows)
                 .Add(DynamicGridOption.SelectColumns)
                 .Add(DynamicGridOption.MultiSelect)