Powerpoint Color part of string

Hello,
I'm new with Open Tbs .
Here is my problem :

In my template I call [onshow.var]
Php side I use $var= "This is an example text ";

My question is , how can I get "example" to be bold and with an other color?

Thanks for you help

Hi Sam,

This is quite difficult.
You can read this thread:
  http://www.tinybutstrong.com/forum.php?thr=2885