How to get a new value when changing the pointer in a radio button, and not the old one?

Question

WPF

There is this code:

<Style
        x:Key="Item"
        BasedOn="{x:Null}"
        TargetType="{x:Type ListBoxItem}">
        <Setter Property="HorizontalContentAlignment" Value="Stretch" />
        <Setter Property="VerticalContentAlignment" Value="Stretch" />
        <Setter Property="Foreground" Value="Black" />
        <Setter Property="Height" Value="42" />
        <Setter Property="Margin" Value="-2,0,0,0" />
        <Setter Property="local:PeakHelper.IsRadioButton" Value="0"/>
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type ListBoxItem}">
                    <Grid x:Name="ListItem">
                        <Grid.ColumnDefinitions>
                            <ColumnDefinition Width="*" />
                            <ColumnDefinition Width="Auto" />
                            <ColumnDefinition Width="Auto" />
                        </Grid.ColumnDefinitions>
                        <TextBlock
                            x:Name="ListItem_Text"
                            Grid.Column="0"
                            Padding="10,0"
                            HorizontalAlignment="Left"
                            VerticalAlignment="Center"
                            FontSize="13"
                            FontWeight="Medium"
                            Foreground="{TemplateBinding Foreground}"
                            Text="{TemplateBinding Content}" />
                        <RadioButton
                            x:Name="PART_SelectVariable_1"
                            Grid.Column="1"
                            Content="Вариант 1"
                            Style="{StaticResource {x:Type ToggleButton}}" />
                        <RadioButton
                            x:Name="PART_SelectVariable_2"
                            Grid.Column="2"
                            Content="Вариант 2"
                            Style="{StaticResource {x:Type ToggleButton}}" />
                    </Grid>
                    <ControlTemplate.Triggers>
                        <Trigger Property="IsMouseOver" Value="True">
                            <Setter TargetName="ListItem" Property="Background" Value="#FF203FE6" />
                            <Setter TargetName="ListItem_Text" Property="Foreground" Value="White" />
                        </Trigger>
                        <Trigger Property="IsEnabled" Value="false">
                            <Setter TargetName="ListItem" Property="Background" Value="LightGray" />
                            <Setter TargetName="ListItem_Text" Property="Foreground" Value="DarkGray" />
                        </Trigger>
                        <Trigger Property="IsSelected" Value="True">
                            <Setter TargetName="ListItem" Property="Background" Value="#FFFDDFAD" />
                            <Setter TargetName="ListItem_Text" Property="Foreground" Value="#FFA47C38" />
                        </Trigger>
                        <DataTrigger Binding="{Binding IsChecked, ElementName=PART_SelectVariable_1}" Value="True">
                            <Setter Property="local:PeakHelper.IsRadioButton" Value="1" />
                        </DataTrigger>
                        <DataTrigger Binding="{Binding IsChecked, ElementName=PART_SelectVariable_2}" Value="True">
                            <Setter Property="local:PeakHelper.IsRadioButton" Value="2" />
                        </DataTrigger>
                        <DataTrigger Binding="{Binding IsPressed, ElementName=PART_SelectVariable_1}" Value="True">
                            <Setter Property="IsSelected" Value="True" />
                            <Setter TargetName="ListItem" Property="Background" Value="#FFE8E9F2" />
                            <Setter TargetName="ListItem_Text" Property="Foreground" Value="#FF9A9FB8" />
                        </DataTrigger>
                        <DataTrigger Binding="{Binding IsPressed, ElementName=PART_SelectVariable_2}" Value="True">
                            <Setter Property="IsSelected" Value="True" />
                            <Setter TargetName="ListItem" Property="Background" Value="#FFE8E9F2" />
                            <Setter TargetName="ListItem_Text" Property="Foreground" Value="#FF9A9FB8" />
                        </DataTrigger>
                    </ControlTemplate.Triggers>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>

There is a problem. After clicking on one of the radio buttons, I definitely get only the previous value local:PeakHelper.IsRadioButton (this is a DependencyObject). For example, when I click on the Option 1 radio button, I get either 0 (if all radio buttons start with IsChecked = false) or 2 (if the Option 2 radio button is set to true). After clicking again, I already get the value I need.
How to solve this problem?

Answer 1

Found a solution for this issue. It turns out that there is a certain nuance to the sequence of events.

<!--  ListBoxItem  -->
    <Style x:Key="Item"
           BasedOn="{x:Null}"
           TargetType="{x:Type ListBoxItem}">
        <Setter Property="HorizontalContentAlignment" Value="Stretch"/>
        <Setter Property="VerticalContentAlignment" Value="Stretch"/>
        <Setter Property="Foreground" Value="Black"/>
        <Setter Property="Height" Value="42"/>
        <Setter Property="Margin" Value="-2,0,0,0"/>
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type ListBoxItem}">
                    <Grid x:Name="ListItem">
                        <Grid.ColumnDefinitions>
                            <ColumnDefinition Width="*"/>
                            <ColumnDefinition Width="Auto"/>
                            <ColumnDefinition Width="Auto"/>
                        </Grid.ColumnDefinitions>
                        <TextBlock x:Name="ListItem_Text"
                                   Grid.Column="0"
                                   Padding="10,0"
                                   HorizontalAlignment="Left"
                                   VerticalAlignment="Center"
                                   FontSize="13"
                                   FontWeight="Medium"
                                   Foreground="{TemplateBinding Foreground}"
                                   Text="{TemplateBinding Content}"/>
                        <RadioButton x:Name="PART_SelectVariable_1"
                                     Grid.Column="1"
                                     Content="Вариант 1"
                                     IsEnabled="{TemplateBinding IsEnabled}"
                                     Style="{StaticResource {x:Type ToggleButton}}"/>
                        <RadioButton x:Name="PART_SelectVariable_2"
                                     Grid.Column="2"
                                     Content="Вариант 2"
                                     IsEnabled="{TemplateBinding IsEnabled}"
                                     Style="{StaticResource {x:Type ToggleButton}}"/>
                    </Grid>
                    <ControlTemplate.Triggers>
                        <Trigger Property="IsMouseOver" Value="True">
                            <Setter TargetName="ListItem" Property="Background" Value="#FF203FE6"/>
                            <Setter TargetName="ListItem_Text" Property="Foreground" Value="White"/>
                        </Trigger>
                        <Trigger Property="IsEnabled" Value="false">
                            <Setter TargetName="ListItem" Property="Background" Value="LightGray"/>
                            <Setter TargetName="ListItem_Text" Property="Foreground" Value="DarkGray"/>
                        </Trigger>
                        <Trigger Property="IsSelected" Value="True">
                            <Setter TargetName="ListItem" Property="Background" Value="#FFFDDFAD"/>
                            <Setter TargetName="ListItem_Text" Property="Foreground" Value="#FFA47C38"/>
                        </Trigger>
                        <Trigger Property="local:Styles.IsRadioButton" Value="-1">
                            <Setter Property="DataContext" Value="0"/>
                            <Setter TargetName="PART_SelectVariable_1" Property="IsChecked" Value="false"/>
                            <Setter TargetName="PART_SelectVariable_2" Property="IsChecked" Value="false"/>
                        </Trigger>
                        <DataTrigger Binding="{Binding ElementName=PART_SelectVariable_1, Path=IsPressed}"
                                     Value="True">
                            <Setter TargetName="ListItem" Property="Background" Value="#FFE8E9F2"/>
                            <Setter TargetName="ListItem_Text" Property="Foreground" Value="#FF9A9FB8"/>
                            <Setter Property="local:Styles.IsRadioButton" Value="1"/>
                            <Setter Property="IsSelected" Value="True"/>
                        </DataTrigger>
                        <DataTrigger Binding="{Binding ElementName=PART_SelectVariable_2, Path=IsPressed}"
                                     Value="True">
                            <Setter TargetName="ListItem" Property="Background" Value="#FFE8E9F2"/>
                            <Setter TargetName="ListItem_Text" Property="Foreground" Value="#FF9A9FB8"/>
                            <Setter Property="local:Styles.IsRadioButton" Value="2"/>
                            <Setter Property="IsSelected" Value="True"/>
                        </DataTrigger>

                    </ControlTemplate.Triggers>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>

If you put local:PeakHelper.IsRadioButton into the IsChecked trigger, and cause the SelectedIndex active pointer to change to IsPressed, then I will get the old data. And it was necessary at once everything in IsPressed.
Since IsPressed comes first in the sequence of events, and IsChecked is already second.