About a year ago (20 Mar 2009) David from ThinkGeo wrote this in 'PDF Extension' topic of 'Developer Blog'
"I think it is the HatchStyle, we haven't implemented it yet. I can't remember if it was PdfSharp that didn't have it working yet or we had not finished it. I will check and let you know. In any event the error message should be more descriptive! "
Now I've just downloaded the newest versions of PdfExtension and PdfSharp from ThinkGeo and the HatchStyle brush is still not working. I know it is a minor thing, yet a set of minor things like this prevent us from wrapping up the project. Is there any workaround? How difficult would be to implement the feature? Could I do it and 'donate' the code?