Updated BindingTest sample

samples/BindingTest/MainWindow.xaml

@@ -71,9 +71,9 @@
     <TabItem Header="Commands">
       <StackPanel Margin="18" Gap="4" Width="200">
         <Button Content="Button" Command="{Binding StringValueCommand}" CommandParameter="Button"/>
-        <ToggleButton Content="ToggleButton" Command="{Binding StringValueCommand}" CommandParameter="ToggleButton"/>
-        <CheckBox Content="CheckBox" Command="{Binding StringValueCommand}" CommandParameter="CheckBox"/>
-        <RadioButton Content="RadionButton" Command="{Binding StringValueCommand}" CommandParameter="RadioButton"/>
+        <ToggleButton Content="ToggleButton" IsChecked="{Binding BooleanFlag, Mode=OneWay}" Command="{Binding StringValueCommand}" CommandParameter="ToggleButton"/>
+        <CheckBox Content="CheckBox" IsChecked="{Binding !BooleanFlag, Mode=OneWay}" Command="{Binding StringValueCommand}" CommandParameter="CheckBox"/>
+        <RadioButton Content="RadionButton" IsChecked="{Binding !!BooleanFlag, Mode=OneWay}" Command="{Binding StringValueCommand}" CommandParameter="RadioButton"/>
         <TextBox Text="{Binding Path=StringValue}"/>
       </StackPanel>
     </TabItem>