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This skill provides a standardized, professional workflow for building WPF Custom Controls that are fully templatable and themeable. It guides developers through the critical architectural decisions between UserControls and CustomControls, while enforcing best practices for the Parts and States Model. By automating the declaration of TemplatePart and TemplateVisualState attributes and providing robust patterns for OnApplyTemplate and VisualStateManager logic, it ensures that UI components remain extensible, maintainable, and resilient to incomplete templates.