Problems with BusinessGraphics Gantt Chart: WebDynpro 7.1 SP3

Hi,
i tried the BusinessGraphics Gantt Chart and went through the Code Example for Displaying a Gantt Chart on:
http://help.sap.com/saphelp_nw04/helpdata/en/a8/1cd93f5e0f9015e10000000a155106/content.htm
Unfortunately my gantt does not look and behave like it should:
1) The bars are only small sqares in the middle of one day. I use the same data as in the sample, so the bars should be a couple of days long
2) I added an action, added an EventID to the series and to the point, mapped the parameters. When clicking a point a roundtrip is done. I write a success message with the eventID but often the Gantt Picture is a broken image after this (small red cross).
3) The tooltip of the point is not shown in the chart when pointing on the square
Can anybody help, please?
Thanks
Frank

Thanks a lot! This solved one of three problems. The trick is that you can set the marker for the points (without any effect) and for the series (with effect).
The tooltip shows up now, too. No idea why now and not before...

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