src/vs/workbench/browser/parts/compositeBar.ts/CompositeBar/removeComposite
class CompositeBar:	removeComposite(id: string): void {

		// If it pinned, unpin it first
		if (this.isPinned(id)) {
			this.unpin(id);
		}

		// Remove from the model
		if (this.model.remove(id)) {
			this.updateCompositeSwitcher();
		}
	}