IWorkbenchContentIsVisible Property

Gets or sets the visibility of a pad or document. If false for a pad, the pad is not visible. If false for a document, the document tab header is not visible (but the document itself maybe visible). If true for a pad, the pad may be visible or is collapsed. If true for a document, the document tab header is visible (if it fits in the bar), and the document is visible, if it is selected, too.

bool IsVisible { get; set; }