多项功能优化

WpfApp/MainWindow.xaml

@@ -152,6 +152,7 @@
                 DisplayMemberPath="GradeLevel"
                 ItemsSource="{Binding Grades}"
                 SelectedObjList="{Binding SelectedItems, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" />
+            <ex:ColorPickerControl />
             <Button Command="{Binding ButtonClickCommand}" Content="显示Snackbar" />
             <!--<Border Height="8" CornerRadius="4">s
                 <Border.Background>