OK, finally I got it.

The problem appears if the Tooltip Format property of the chart is set to Custom and the FormatString is empty.

When you draw something on the chart, and ONLY if you pass over an item, the ribbon loses docking (as shown in my first post)

Probably something happens internally in infragicstic dll code (a catched exception ?)

I think it is a bug, because nothing inform you that setting an empty string you will fall into such kind of error ( I don't know if it has already fixed in newer hotfixes, because I have 9.2 with 2042 )

Hope this help

Regards,

Marco

I still have a problem with that...

I'll sum up my problem:

1 - I have to hide ganttchart default tooltips because I show my tooltip manager.

2 - I cannot completely disable tooltips because I still need highlighting feature (coming with tooltips)

so I've set  the format to None

3 - when I pass over an item, the tooltip is correctly not showed, but the ribbon loses its docking (as shown in the first post)

4 - checking at runtime, the tooltips Format is set to Custom (but I set it to None...) and FormatString is empty

5 - The only way to avoid undocking bug, is setting at least one character in the formatString (and obviously set it to custom)... but in this way a little tooltip is shown...

Any solution ?

I’m not really sure what the issue is, but you can try this code:

this.userControlUltraChart1.Tooltips.TooltipControl = null;

this.userControlUltraChart1.Tooltips.UseControl = true;

Sorry, probably I didn't explain well...

anyway the problem is very simple to reproduce:

1 - add a ultraToolBalManager to a form and show ribbon

2 - add an ultrachart and dock it in the main container below the ribbon

3 - set ultrachart tooltips.Format to Custom with an empty FormatString

4 - show something in the chart and pass over an item

5 - try to resize the form --> the behavior is not correct

(or use my attached project, to try it faster)

I've tried to do what you said (after InitializeComponent in the constructor of my form) but doesn't work.

To be more clear, my custom TooltipManager is shown manually in DataItemOver-Out events (because I didn't find a way to replace the default tooltip control of the ultrachart).

Thanks for the help

Ok, I was able to reproduce it. There is some issue and I’ll try fixing it. Until then try hiding the tooltips with:

this.ganttChart.Tooltips.FormatString = " ";

PaintElement pe = new PaintElement(Color.Transparent);

pe.Stroke = Color.Transparent;

this.ganttChart.Tooltips.PE = pe;