I posted a Question half a year ago:
Can you have horizontal lines across the Gantt chart? Our users do not want Pyjama alternative colours but have requested horizontal lines to distinguish rows.
The answer was: draw a line using GDI. We did this, but there are difficulties with printing. You have to make a (nonlinear) correction for vertical line distances for different rowheights, for the report to display the same as the monitor-gantt. Also big problems arise when you have different rowheights within one ganttchart.
The reason why many user prefer horizontal lines is clear: as a black/white print output it is clearer and saves ink.
Will you offer horizontal lines as a standardfeature in future, as an alternative to pyjamas?
Sure we could extend the API to allow for row separating lines, but if there are issues with positioning user drawn things when printing we would like to fix it. Chances are that there is some simple mistake in your current code. Can you send me a sample showing the problems you have with printing and positioning of your user drawn lines and I will take a look at it…