RadControls for WinForms

 RadMessageBox provides localization of its buttons text via RadMessageLocalizationProvider:

1. Start by creating a descendant of the RadGridLocalizationSettings class. Then override the GetLocalizedString(string id) method, and, in its implementation, provide a translation for the label and user messages. If one is not provided, the default value will be returned - this is guaranteed by the call to the base GetLocalizedString method in the default clause of the switch statement.
   Copy[C#] Creating a custom localization provider

   public class MyRadMessageLocalizationProvider : RadMessageLocalizationProvider
   {
       public override string GetLocalizedString(string id)
       {
           switch (id)
           {
               case RadMessageStringID.AbortButton: return "Abbruch";
               case RadMessageStringID.CancelButton: return "Löschen";
               case RadMessageStringID.IgnoreButton: return "Ignorieren";
               case RadMessageStringID.NoButton: return "Nein";
               case RadMessageStringID.OKButton: return "OK";
               case RadMessageStringID.RetryButton: return "Wiederholung";
               case RadMessageStringID.YesButton: return "Ja";
               default:
                   return base.GetLocalizedString(id);
           }
       }
   }

   Copy[VB.NET] Creating a custom localization provider

   Public Class MyRadMessageLocalizationProvider
       Inherits RadMessageLocalizationProvider
   
       Public Overloads Overrides Function GetLocalizedString(ByVal id As String) As String
           Select Case id
               Case RadMessageStringID.AbortButton
                   Return "Abbruch"
               Case RadMessageStringID.CancelButton
                   Return "Löschen"
               Case RadMessageStringID.IgnoreButton
                   Return "Ignorieren"
               Case RadMessageStringID.NoButton
                   Return "Nein"
               Case RadMessageStringID.OKButton
                   Return "OK"
               Case RadMessageStringID.RetryButton
                   Return "Wiederholung"
               Case RadMessageStringID.YesButton
                   Return "Ja"
               Case Else
                   Return MyBase.GetLocalizedString(id)
           End Select
       End Function
   End Class

2. To apply the custom localization provider, instantiate and assign it to the current localization provider:
   Copy[C#] Setting the custom localization provider to RadMessageBox

   RadMessageLocalizationProvider.CurrentProvider = new MyRadMessageLocalizationProvider();

   Copy[VB.NET] Setting the custom localization provider to RadMessageBox

   RadMessageLocalizationProvider.CurrentProvider = New MyRadMessageLocalizationProvider()