Uncheck Checkbox inside bulletdecorator WPF

Looking for a little insight.

I have a checkbox that I have set to a style because I needed to make the actual box match with the text size and position. The style code is as follows:

Style TargetType="{x:Type CheckBox}" x:Key="recogCheckbox">
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="{x:Type CheckBox}">
                <StackPanel Orientation="Horizontal">
                    <CheckBox Margin="130,4,0,0"/>
                    <BulletDecorator Name="customBullet" Margin="2,0,0,0" Grid.Column="0" Grid.Row="0" VerticalAlignment="Center">
                    <TextBlock Width="100" TextWrapping="Wrap" HorizontalAlignment="Left" Foreground="White" Margin="5,0,0,0" Text="Recognition Call"/>
                    </BulletDecorator>
                    <ContentPresenter/>
                </StackPanel>
            </ControlTemplate>
        </Setter.Value>
    </Setter>
</Style>    

The xaml code for the checkbox is this:

<CheckBox FontFamily="Microsoft Sans Serif" FontSize="12" FontWeight="Bold" Height="20" HorizontalAlignment="Left" HorizontalContentAlignment="Center" Margin="717,193,0,0" 
              Name="recognitionCheckBox" Style="{StaticResource recogCheckbox}" VerticalAlignment="Top" Width="384" >
</CheckBox>

I am trying to use a clear button on my application so that it unchecks the checkbox but when I reference the checkbox name 'recognitionCheckBox' by using recognitionCheckBox.isChecked = false it does not uncheck the checkbox which I think is because the actual box is inside the style which I am having trouble referencing in the C# code behind.

Does anyone know of a way to uncheck the checkbox within the style. I have been searching several sites but not found anything that has helped me yet.