title: Different colors for column chart
body: <p>I am using ExtJS to render charts, but my column chart is getting with the same color for all series. I need different colors for the series. Only happens with column, bar and area charts, the line chart is working fine.</p>
  
  <p>My code:</p>
  
  <pre><code>Ext.Ajax.request({
          method: 'get',
          url: Webapp.link('chart/' + key),
          success: function(response){
              var resposta = Ext.JSON.decode(response.responseText);
              var chart = Ext.create('Hemisphere.view.chart.Chart', {
                  axes: resposta.chart.axes,
                  series: resposta.chart.series,
                  store: store (The store is defined previously)
              });
              panel.removeAll();
              panel.add(chart);
              }
          }
      });
  </code></pre>
  
  <p>Anyone could help me? Thanks.
  <img src="https://i.stack.imgur.com/J5FFh.png" alt="enter image description here"></p>
  
  <p>One serie code example.</p>
  
  <p><img src="https://i.stack.imgur.com/nddlm.png" alt="enter image description here"></p>
  
  <p><img src="https://i.stack.imgur.com/8qS35.png" alt="enter image description here"></p>