code: function writeWidthIfContentOccupiesWholeArea(sArea, oRm, oControl) {
  		var bContentLeft = !!oControl.getContentLeft().length,
  			bContentMiddle = !!oControl.getContentMiddle().length,
  			bContentRight = !!oControl.getContentRight().length;
  
  		function writeAndUpdate() {
  			oRm.addStyle("width", "100%");
  			oRm.writeStyles();
  		}
  		switch (sArea.toLowerCase()) {
  			case "left":
  				if (bContentLeft && !bContentMiddle && !bContentRight) {
  					writeAndUpdate();
  				}
  				break;
  			case "middle":
  				if (bContentMiddle && !bContentLeft && !bContentRight) {
  					writeAndUpdate();
  				}
  				break;
  			case "right" :
  				if (bContentRight && !bContentLeft && !bContentMiddle) {
  					writeAndUpdate();
  				}
  				break;
  			default:
  				Log.error("Cannot determine which of the three content aggregations is alone");
  		}
  	}
docs: Adds width style to 100% in case of the given content container is the only container with content amongst the three (left, middle, right)
  @param {string} sArea The content container - one of the left, middle or right
  @param {sap.ui.core.RenderManager} oRm The RenderManager that can be used for writing to the Render-Output-Buffer.
  @param {sap.ui.core.Control} oControl the Bar instance
  @private