-> If you're using C++/WinRT, then the [**BindableAttribute**](/windows/windows-app-sdk/api/winrt/microsoft.ui.xaml.data.bindableattribute) attribute is available if you've installed the Windows SDK version 10.0.17763.0 (Windows 10, version 1809), or later. Without that attribute, you'll need to implement the [ICustomPropertyProvider](/windows/windows-app-sdk/api/winrt/microsoft.ui.xaml.data.icustompropertyprovider) and [ICustomProperty](/windows/windows-app-sdk/api/winrt/microsoft.ui.xaml.data.icustomproperty) interfaces in order to be able to use the [{Binding}](/windows/uwp/xaml-platform/binding-markup-extension) markup extension.
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