_closePane = function (pane, setHandles) {
		var
			$P	= $Ps[pane]
		,	s	= state[pane]
		;
		_hidePane(pane);
		s.isClosed = true;
		s.isVisible = false;
		if (setHandles) setAsClosed(pane);
	}
Utility method used during init or other auto-processes

@param {string}	pane   The pane being closed
@param {boolean=}	[setHandles=false]