Bug 455595 - GanttChart does not work in WindowsBuilder

Final fix. I copied the code from Emil Crumhorn's Homepage.
(2.0-NIGHTLY).

Change-Id: Ibb5f4bf2e575b41aefb0d073d4c0970ab7d87eb1
Signed-off-by: Nathalie Schätzle <nathalie.schaetzle@web.de>
Merge "Bug 455595 - GanttChart does not work in WindowsBuilder"