title: CORE PLOT add one more Graph in Vertical BarChart
body: <p>Hi I want to make bar chart as  shown here</p>
  
  <p><img src="https://i.stack.imgur.com/rv8hV.jpg" alt="enter image description here"></p>
  
  <p>I want to plot graph using coreplot example : (coreplot gallery- Vertical Bar Chart) </p>
  
  <p>Currently default code plots the graph as shown below</p>
  
  <p><img src="https://i.stack.imgur.com/NPU7Z.jpg" alt="enter image description here"></p>
  
  <p>How can I achieve this?</p>
  
  <p>I tried adding another graph but didn't work out well.</p>
  
  <p>Please Help and Suggest</p>
  
  <p>Thanks</p>