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Sub row styling

I'm trying to add css styling to a sub_row via xml:

print("<cell class=\"subrow\"><![CDATA[");
print($row['notes']);
print("]]></cell>");

This works if CDATA is not present but does not work in this example.

Is there another way of adding css to a sub_row?

The same code works as expected in local samples - defined css class applied to the cell in question, but it will affect only cell in related column - not the text in sub-row

If you need to affect the text in sub-row - you can add custom rules to the dhx_sub_row css class
<style>
     .dhx_sub_row{
         font-weight:bold;
     }
</style>
Or use inline styles as
print("<cell class=\"subrow\"><![CDATA[<span class='subrow'>"); 
print($row['notes']); 
print("</span>]]></cell>");

Adding a sub_row css class worked.

However, the inline style added a '+' sign to every row - including rows that have no sub_row.

It can be resolved by adjusting code of grid or server side code, which generates data. 
In case of server side code it will look as 
print("<cell class=\"subrow\">");
if ($row['notes']) print("<![CDATA[<span class='subrow'>".$row['notes']."</span>]]>");  
print("</cell>");
In such case , unnecessary tags will not affect empty sub-elements