it's possible these circumstances would cause our "is design time" test to fail.  in the AddToControlsCollection method you see in your stack trace, we execute this code:

            if (chartControl != null && chartControl.DesignMode)
            {
                return;
            }

over the years, I have seen quite a few cases of incorrect values being returned from the Control class's DesignMode property.  perhaps this is the problem.  i'm fairly certain we can provide a solution in a service release, but before that happens,  I'd like to make sure we can reproduce the problem just as you are experiencing it.

Hi,

I'm getting the same error. I just placed a UltraChart on a normal Windows-TabPage. I commented out everything that has to do with Tooltips, but it doesn't work. There is no designer-code that uses IGWinTooltip at all.

I'm running on a german Windows XP SP3, VS 2008 TS Development with SP1 and Infragistics NetAdvantage 2009 Vol. 1.

Alex

I will get you something. In the meantime there is another twist I failed to mention. The chart control is on a user control, that is then placed on the tab page. Could that be the culprit?

Thanks.

andrewscg,

can you provide steps to reproduce or a sample project?  i tried adding a Windows Forms TabControl to a new form, then dropped a chart inside its tabPage2, and did not observe any errors.

I am running 8.3.20083.2132 and still get this error at design time but not runtime.