Triggers on Border refer to checkbox

I wanted to change the borderBrush if one of the checkbox in the itemscontrol is checked. But i just don't know how to set it. How can i refer to the IsChecked property of the checkbox in the border trigger ?

Thank's for help !

This is my xaml code:

<Border Margin="5"                     
                Grid.Row="1"
                Grid.Column="1"
                Grid.ColumnSpan="3"
                BorderThickness="1"
                >
            <Border.Style>
                <Style TargetType="{x:Type Border}">
                    <Setter Property="BorderBrush" Value="LightGray"/>
                    <Style.Triggers>
                        <DataTrigger Binding="{Binding ElementName=CheckBox, Path=IsChecked}" Value="False">
                            <Setter Property="BorderBrush" Value="Red"/>
                        </DataTrigger>
                        <DataTrigger Binding="{Binding ElementName=CheckBox, Path=IsChecked}" Value="True" >
                            <Setter Property="BorderBrush" Value="LightGray"/>
                        </DataTrigger>
                    </Style.Triggers>
                </Style>
            </Border.Style>
            <ScrollViewer Height="100">
            <ItemsControl Margin="5"
                          ItemsSource="{Binding AimList, Mode=OneWay}"
                          IsEnabled="{Binding IsEnable}"
                          >
                        <ItemsControl.ItemsPanel>
                    <ItemsPanelTemplate>
                            <UniformGrid Margin="5" Columns="2" />
                        </ItemsPanelTemplate>
                </ItemsControl.ItemsPanel>
                    <ItemsControl.ItemTemplate>
                        <DataTemplate>
                            <CheckBox Name="CheckBox"
                                      Content="{Binding Lib, Mode=OneWay}" 
                                      IsChecked="{Binding IsChecked, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" 
                                      Margin="5"/>
                        </DataTemplate>
                    </ItemsControl.ItemTemplate>
            </ItemsControl>
        </ScrollViewer>
    </Border>