function _computeAutoHeight( element ) {

	switch ( element._flexDirection._value ) {

		case 'row' :
		case 'row-reverse' :
			return _computeHighestChildHeight( element );


		case 'column' :
		case 'column-reverse' :
			return AutoSizePropertyBox_computeChildrenSideHeight( element );

	}

}
Retrieve the automatic height from children boxes
@param {MeshUIBaseElement} element
@return {number}