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Jul 13, 2018
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Mention how to achieve two-way binding #6439

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3 changes: 2 additions & 1 deletion docs/framework/wpf/advanced/templatebinding-markup-extension.md
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Expand Up @@ -32,7 +32,8 @@ Links the value of a property in a control template to be the value of another p
|`sourceProperty`|Another dependency property that exists on the type being templated, specified by its <xref:System.Windows.DependencyProperty.Name%2A?displayProperty=nameWithType>.<br /><br /> - or -<br /><br /> A "dotted-down" property name that is defined by a different type than the target type being templated. This is actually a <xref:System.Windows.PropertyPath>. See [PropertyPath XAML Syntax](../../../../docs/framework/wpf/advanced/propertypath-xaml-syntax.md).|

## Remarks
A `TemplateBinding` is an optimized form of a [Binding](../../../../docs/framework/wpf/advanced/binding-markup-extension.md) for template scenarios, analogous to a `Binding` constructed with `{Binding RelativeSource={RelativeSource TemplatedParent}}`. A `TemplateBinding` is always a one-way binding, even if properties involved default to two-way binding. Both properties involved must be dependency properties.
A `TemplateBinding` is an optimized form of a [Binding](../../../../docs/framework/wpf/advanced/binding-markup-extension.md) for template scenarios, analogous to a `Binding` constructed with `{Binding RelativeSource={RelativeSource TemplatedParent}}`. A `TemplateBinding` is always a one-way binding, even if properties involved default to two-way binding. Both properties involved must be dependency properties. In order to achieve two-way binding to a templated parent use the following binding statement instead
`{Binding RelativeSource={RelativeSource TemplatedParent}, Mode=TwoWay, Path=MyDependencyProperty}`.

[RelativeSource](../../../../docs/framework/wpf/advanced/relativesource-markupextension.md) is another markup extension that is sometimes used in conjunction with or instead of `TemplateBinding` in order to perform relative property binding within a template.

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