Debug One Problem:Windows Phone Buttons Not Accessable

There is one problem I needed debugged:

Every time I add a button to a page in Windows Phone Development, I am unable to access this button programatically.

The video which describes the problem in detail:

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NOTE: I am able to create buttons and access them programatically in a newly created project.

Arquitectura de software Windows Mobile

Nº del proyecto: #5481397

Sobre el proyecto