WPF: Binding and Commands

My Customer has a property called SaveCommand.

My form is data-bound to an instance of the Customer object.

Using XAML, how would I bind Customer.SaveCommand to the form's save 开发者_如何转开发button?

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Assuming the form's DataContext has been set to the customer object

<Button Content="Save Button" Command="{Binding SaveCommand}" />

or perhaps

<Button Content="Save Button" Command="{Binding SelectedCustomer.SaveCommand}" />