function adaptSizeAndPosition($BlockRef, oWithin) {
		var oClientRect = oWithin.getBoundingClientRect();

		$BlockRef
			.css({
				width: oClientRect.width,
				height: oClientRect.height
			})
			.addClass("sapUiBLyWithin")
			.position({
			my: "left top",
			at: "left top",
			of: oWithin
		});
	}
Change the size and position of the blocklayer to the same values as for the given 'within'.

@param {jQuery} $BlockRef the jQuery object that contains the blocklayer DOM element
@param {Element} oWithin the DOM element of the given within
@private