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Binding in a Control Template
When you're creating a control template and you want to bind to the templated parent you can use:
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<TextBlock Name="tb" Text="{TemplateBinding Caption}"/>
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<!-- Which is the same as -->
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<TextBlock Name="tb" Text="{Binding Caption, RelativeSource={RelativeSource TemplatedParent}}"/>
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Although the two syntaxes shown here are equivalent in this case, there is a difference.
TemplateBinding accepts only a single property rather than a property path, so if you want to bind using a property path you must use the second syntax:1
<!-- This WON'T work as TemplateBinding only accepts single properties -->
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<TextBlock Name="tb" Text="{TemplateBinding Caption.Length}"/>
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<!-- Instead this syntax must be used in this case -->
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<TextBlock Name="tb" Text="{Binding Caption.Length, RelativeSource={RelativeSource TemplatedParent}}"/>
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