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This skill provides Claude with the specialized knowledge required to resolve common interactivity issues in WPF applications where custom-drawn elements fail to receive mouse events. It focuses on the critical pattern of drawing a transparent background within the OnRender method of classes inheriting from FrameworkElement. This ensures the WPF hit testing engine correctly registers mouse interactions across the entire control surface, which is essential for building custom overlays, measurement tools, and interactive graphics components that don't rely on standard control backgrounds.
