Message in Spanish (Español)
El control extensor '<var>X</var>' no puede extender '<var>Y</var>'. Los controles extensores de tipo '<var>Type Name</var>' no pueden extender controles de tipo 'X'.
Unlocalized message
Extender control '<var>X</var>' cannot extend '<var>Y</var>'. Extender controls of type '<var>Type Name</var>' cannot extend controls of type 'X'.
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