Changing buttons languege in a message box

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Silverlight

Hi in a Silverlight project I am using the following code for shoeing a message box, It works ,but is it possible changing its Language? I mean that I want to have custom items instead of Ok and Cancel button.

if (MessageBox.Show("Message", "header", MessageBoxButton.OKCancel) == MessageBoxResult.Cancel)
              { return; }

and

MessageBox.Show("message", "", MessageBoxButton.OK);

and I do not create another custom message box
thanks.