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...ly "open" to reveal additional items hidden underneath. If the particular disclosure triangle is already open, clicking on it will usually re-close (collapse) t [[Image:Disclosure triangle open.jpg|thumb|none|158px|Showing a disclosure triangle in the Media Center UI (circled in red), with the triangle "open".

...ying Now'' list. These arrows are called [[Disclosure_triangle|disclosure triangles]], and they are used throughout Media Center for many parts of the UI.