How Design a style in WPF radiobutton like checkbox - wpf

Question

I want to have a radiobutton similar to checkbox, so I define a style in Dictionary file like:
<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="clr-namespace:WpfCheckBoxLikeRadiobutton">
<Style x:Key="MyRadioButton" TargetType="{x:Type RadioButton}">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type RadioButton}">
<Grid>
<CheckBox
IsChecked="{Binding RelativeSource={RelativeSource TemplatedParent},
Path=IsChecked, Mode=TwoWay}"
IsHitTestVisible="False" />
<CheckBox
IsChecked="{Binding RelativeSource={RelativeSource TemplatedParent},
Path=IsChecked, Mode=TwoWay}" Opacity="0"/>
</Grid>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
and merge it in app.xaml file like this
<Application x:Class="WpfCheckBoxLikeRadiobutton.App"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="clr-namespace:WpfCheckBoxLikeRadiobutton"
StartupUri="MainWindow.xaml">
<Application.Resources>
<ResourceDictionary>
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="Dictionary1.xaml" />
</ResourceDictionary.MergedDictionaries>
</ResourceDictionary>
</Application.Resources>
and then use it in my window
<GroupBox Margin="5" Padding="5">
<StackPanel >
<CheckBox Content="this is checkbox" />
<RadioButton Content="this is first radio button" Style="{DynamicResource MyRadioButton}"/>
<RadioButton Content="this is Second radio button" Style="{DynamicResource MyRadioButton}"/>
<RadioButton Content="this is third radio button" Style="{DynamicResource MyRadioButton}"/>
</StackPanel>
</GroupBox>
but after assigning style for radiobutton, that content will disappear.
What is the wrong with my style?

Answer 1

It happens because you ignore content of your control in you ControlTemplate. Your style should look like this:
<Style x:Key="MyRadioButton" TargetType="{x:Type RadioButton}">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type RadioButton}">
<Grid>
<CheckBox
IsChecked="{Binding RelativeSource={RelativeSource TemplatedParent},
Path=IsChecked, Mode=TwoWay}"
IsHitTestVisible="False" Content="{TemplateBinding Content}" />
<CheckBox
IsChecked="{Binding RelativeSource={RelativeSource TemplatedParent},
Path=IsChecked, Mode=TwoWay}"
Content="{TemplateBinding Content}" Opacity="0"/>
</Grid>
</ControlTemplate>
</Setter.Value>
</Setter>

Answer 2

I think you can even do more simple and make it look better, just right click --> EditStyle and replace every ellipse with rectangle in the template. There are a lot of animations you won't loose this way.
This is what I did it looks nice, you can also copy the "CheckIcon" from the checkbox style to make it looks exactly like a checkbox if you want to.

Answer 3

In addition to Verbon's answer I have a style where checkbox will look like radio buttons.<Style x:Key="CheckBoxRadioButtonStyle" TargetType="CheckBox">
<Setter Property="Background" Value="Transparent"/>
<Setter Property="Foreground" Value="{ThemeResource SystemControlForegroundBaseHighBrush}"/>
<Setter Property="Padding" Value="3"/>
<Setter Property="HorizontalAlignment" Value="Center"/>
<Setter Property="VerticalAlignment" Value="Center"/>
<Setter Property="HorizontalContentAlignment" Value="Left"/>
<Setter Property="VerticalContentAlignment" Value="Center"/>
<Setter Property="FontFamily" Value="{ThemeResource ContentControlThemeFontFamily}"/>
<Setter Property="FontSize" Value="{ThemeResource ControlContentThemeFontSize}"/>
<Setter Property="MinWidth" Value="30"/>
<Setter Property="UseSystemFocusVisuals" Value="True"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="CheckBox">
<Grid BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="20"/>
<ColumnDefinition Width="*"/>
</Grid.ColumnDefinitions>
<VisualStateManager.VisualStateGroups>
<VisualStateGroup x:Name="CommonStates">
<VisualState x:Name="Normal"/>
<VisualState x:Name="PointerOver">
</VisualState>
<VisualState x:Name="Pressed">
<Storyboard>
<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Stroke" Storyboard.TargetName="OuterEllipse">
<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlHighlightBaseMediumBrush}"/>
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Stroke" Storyboard.TargetName="CheckOuterEllipse">
<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlHighlightBaseMediumBrush}"/>
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Fill" Storyboard.TargetName="CheckOuterEllipse">
<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlHighlightTransparentBrush}"/>
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Fill" Storyboard.TargetName="CheckGlyph">
<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlHighlightAltBaseMediumBrush}"/>
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</VisualState>
<VisualState x:Name="Disabled">
<Storyboard>
<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Stroke" Storyboard.TargetName="OuterEllipse">
<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlDisabledBaseLowBrush}"/>
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Stroke" Storyboard.TargetName="CheckOuterEllipse">
<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlDisabledBaseLowBrush}"/>
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Fill" Storyboard.TargetName="CheckOuterEllipse">
<DiscreteObjectKeyFrame KeyTime="0" Value="Transparent"/>
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Fill" Storyboard.TargetName="CheckGlyph">
<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlDisabledBaseLowBrush}"/>
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Foreground" Storyboard.TargetName="ContentPresenter">
<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlDisabledBaseLowBrush}"/>
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</VisualState>
</VisualStateGroup>
<VisualStateGroup x:Name="CheckStates">
<VisualState x:Name="Checked">
<Storyboard>
<DoubleAnimation Duration="1" To="0" Storyboard.TargetProperty="Opacity" Storyboard.TargetName="CheckGlyph"/>
<DoubleAnimation Duration="0" To="1" Storyboard.TargetProperty="Opacity" Storyboard.TargetName="OuterEllipse"/>
<DoubleAnimation Duration="0" To="0" Storyboard.TargetProperty="Opacity" Storyboard.TargetName="CheckOuterEllipse"/>
</Storyboard>
</VisualState>
<VisualState x:Name="Unchecked">
<Storyboard>
<DoubleAnimation Duration="0" To="0" Storyboard.TargetProperty="Opacity" Storyboard.TargetName="OuterEllipse"/>
<DoubleAnimation Duration="0" To="1" Storyboard.TargetProperty="Opacity" Storyboard.TargetName="CheckOuterEllipse"/>
<DoubleAnimation Duration="0" To="1" Storyboard.TargetProperty="Opacity" Storyboard.TargetName="CheckGlyph"/>
</Storyboard>
</VisualState>
<VisualState x:Name="Indeterminate"/>
</VisualStateGroup>
</VisualStateManager.VisualStateGroups>
<Grid Height="32" VerticalAlignment="Top">
<Ellipse x:Name="OuterEllipse" Height="20" Fill="Green" Stroke="Green" Opacity="0" StrokeThickness="{ThemeResource RadioButtonBorderThemeThickness}" UseLayoutRounding="False" Width="20"/>
<Ellipse x:Name="CheckOuterEllipse" Fill="White" Height="20" Opacity="1" Stroke="Gray" StrokeThickness="{ThemeResource RadioButtonBorderThemeThickness}" UseLayoutRounding="False" Width="20"/>
<Ellipse x:Name="CheckGlyph" Fill="White" Height="12" Opacity="1" UseLayoutRounding="False" Width="12"/>
</Grid>
<ContentPresenter x:Name="ContentPresenter" AutomationProperties.AccessibilityView="Raw" ContentTemplate="{TemplateBinding ContentTemplate}" ContentTransitions="{TemplateBinding ContentTransitions}" Content="{TemplateBinding Content}" Grid.Column="1" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" Margin="{TemplateBinding Padding}" TextWrapping="Wrap" VerticalAlignment="{TemplateBinding VerticalContentAlignment}"/>
</Grid>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
Then merge above style into Verbon's style :
<Grid>
<CheckBox IsChecked="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=IsChecked, Mode=TwoWay}" IsHitTestVisible="False" Content="{TemplateBinding Content}" Style="{StaticResource CheckBoxRadioButtonStyle}"/>
<CheckBox IsChecked="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=IsChecked, Mode=TwoWay}" Content="{TemplateBinding Content}" Opacity="0" Style="{StaticResource CheckBoxRadioButtonStyle}"/>
</Grid>