title: Trendline conditional formatting
body: <p>I wasn't successful in finding a solution to my question by googling it, so i hope here there are experts that can help.</p>
  
  <p>I just have one set of data over time (the number of actions per date, so for one month, two columns and 30 rows). I am using a clustered column chart to visualize that data, and have placed a trendline on it.</p>
  
  <p>I would like to change the color of the trendline dynamicaly, to RED if it it descending, or GREEN if ascending. That's it.</p>
  
  <p>Whatever option I tried in Excel 2013, I haven't found the solution, and programmaticaly, I am too "dummy".</p>