 		for (i = 0; i < IConstraintLayout(target).constraintRows.length; i++)
 		{
 			var row:ConstraintRow = IConstraintLayout(target).constraintRows[i];
-			if (row.mx_internal::contentSize)
+			if (row.contentSize)
 			{
 				if (row.id == topBoundary)
 				{

				cc = cols[i];
				if (!isNaN(cc.percentWidth))
					percentageSize.push(cc);
				else if (!isNaN(cc.width) && !cc.mx_internal::contentSize)
					fixedSize.push(cc);
				else 
				{
					contentSize.push(cc);
					cc.mx_internal::contentSize = true;
				}
			}
			//fixed size columns 

 		for (i = 0; i < IConstraintLayout(target).constraintColumns.length; i++)
 		{
 			var col:ConstraintColumn = IConstraintLayout(target).constraintColumns[i];
 			if (col.contentSize)
 			{
 				if (col.id == leftBoundary)
 				{
