<StackPanel>
<CheckBox IsChecked="{Binding IsChecked, ElementName=checkbox}" Content="Hello">
<CheckBox.Template>
<ControlTemplate TargetType="CheckBox">
<ContentPresenter/>
</ControlTemplate>
</CheckBox.Template>
</CheckBox>
<CheckBox x:Name="checkbox" Content="A normal checkbox"/>
</StackPanel>
Note that the above template does not alter the appearance of the label based on whether it's checked or not. That might be something you'll need - hard to say without more information.
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