.NET Framework error in Português (Portuguese):

RelativeSource.Mode é imutável após a inicialização; em vez de alterar Mode nesta instância, crie um novo RelativeSource ou utilize uma instância estática diferente.

English translation: RelativeSource.Mode is immutable after initialization; instead of changing the Mode on this instance, create a new RelativeSource or use a different static instance.

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RelativeSource.Mode é imutável após a inicialização; em vez de alterar Mode nesta instância, crie um novo RelativeSource ou utilize uma instância estática diferente.

English translation: RelativeSource.Mode is immutable after initialization; instead of changing the Mode on this instance, create a new RelativeSource or use a different static instance.