tidy up some demo code

Author: ButchersBoy

MainDemo.Wpf/Pickers.xaml

@@ -35,7 +35,13 @@
                     </Binding>
                 </DatePicker.SelectedDate>
             </DatePicker>
-            <ComboBox Name="cboLocale" HorizontalAlignment="Left" Width="50" Margin="0 32 0 0"/>
+            <ComboBox Name="LocaleCombo" HorizontalAlignment="Left" Width="50" Margin="0 32 0 0">
+                <ComboBox.ItemsPanel>
+                    <ItemsPanelTemplate>
+                        <VirtualizingStackPanel />
+                    </ItemsPanelTemplate>
+                </ComboBox.ItemsPanel>
+            </ComboBox>
             <DatePicker Name="LocaleDatePicker" Width="120" HorizontalAlignment="Left" Margin="0 16 0 0" materialDesign:HintAssist.Hint="Locale Date" />
             <DatePicker Name="LocaleDatePickerRTL" Width="120" HorizontalAlignment="Left" Margin="0 16 0 0" materialDesign:HintAssist.Hint="RTL Locale Date" FlowDirection="RightToLeft" />
         </StackPanel>

MainDemo.Wpf/Pickers.xaml.cs

@@ -27,13 +27,13 @@ public Pickers()
             InitializeComponent();
             FutureDatePicker.BlackoutDates.AddDatesInPast();
             LoadLocales();
-            cboLocale.SelectionChanged += CboLocale_SelectionChanged;
-            cboLocale.SelectedItem = "fr-CA";
+            LocaleCombo.SelectionChanged += LocaleCombo_SelectionChanged;
+            LocaleCombo.SelectedItem = "fr-CA";
         }
 
-        private void CboLocale_SelectionChanged(object sender, SelectionChangedEventArgs e)
+        private void LocaleCombo_SelectionChanged(object sender, SelectionChangedEventArgs e)
         {
-            var lang = System.Windows.Markup.XmlLanguage.GetLanguage(cboLocale.SelectedItem as string);
+            var lang = System.Windows.Markup.XmlLanguage.GetLanguage((string)LocaleCombo.SelectedItem);
             LocaleDatePicker.Language = lang;
             LocaleDatePickerRTL.Language = lang;
 
@@ -46,12 +46,11 @@ private void CboLocale_SelectionChanged(object sender, SelectionChangedEventArgs
 
         private void LoadLocales()
         {
-            foreach (CultureInfo ci in CultureInfo.GetCultures(CultureTypes.AllCultures).OrderBy(ci => ci.Name))
+            foreach (var ci in CultureInfo.GetCultures(CultureTypes.AllCultures)
+                .Where(ci => ci.Calendar is GregorianCalendar)
+                .OrderBy(ci => ci.Name))
             {
-                if (ci.Calendar is GregorianCalendar)
-                {
-                    cboLocale.Items.Add(ci.Name);
-                }
+                LocaleCombo.Items.Add(ci.Name);
             }
         }