Ability to show y-axis labels on both sides of a stacked bar chart. This is necessary when a scale has been asked where the end points for each bar in the chart are different. For example, the scale could be between "I prefer cats" to "I do not prefer cats" and it should be possible to show the "I prefer cats" label on the left, the "I do not prefer cats" on the right, and the stacked bar between the two, showing all the scale points.