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DependencyProperty '<var>Property Name</var>:<var>X</var>' n'est pas en lecture seule. La méthode SetReadOnlyPropertyValue ne peut être appelée que sur des propriétés de dépendance en lecture seule.
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Dependency Property '<var>Property Name</var>:<var>X</var>' is not Read Only. SetReadOnlyPropertyValue can only be called on Read Only Dependency Properties.
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