title: Dynamic styling of Crosstab cel
body: <p>In a crosstab cel i need to style text looking something outside the crosstab data (something like a third dimension of crosstab)</p>
  
  <p>example data (articles):</p>
  
  <pre><code>|name|color|kind    |qty|
  -------------------------
  |A1  |red  |standard|1  |
  |A1  |green|extra   |5  |
  |A1  |green|extra   |10 |
  |A2  |red  |standard|2  |
  |A2  |green|standard|5  |
  </code></pre>
  
  <p>Crosstab output:</p>
  
  <pre><code>|  |red|green|
  --------------
  |A1|1  |15   |
  |A2|2  |5    |
  </code></pre>
  
  <p>I'd like to change style of the 15 cel beacuse it has some "extra" kind article inside.
  I wrote a Style rule based on field but there is a report error "Field not found".</p>