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<Border BorderBrush="Black" BorderThickness="1">
<CheckBox>
<Button Content="123" Margin="20" />
</CheckBox>
</Border>
<Border BorderBrush="Black" BorderThickness="1">
<CheckBox x:Name="chb">
<CheckBox.Style>
<Style TargetType="{x:Type CheckBox}">
<Style.Triggers>
<DataTrigger Binding="{Binding ElementName=btn,Path=IsChecked}" Value="True">
<Setter Property="IsChecked" Value="True"></Setter>
</DataTrigger>
</Style.Triggers>
</Style>
</CheckBox.Style>
<ToggleButton x:Name="btn" Content="123" Margin="20" />
</CheckBox>
</Border>