Hi :¬)

We have large data sets and we augment the scatercharts we do with robust curve fitting functions
We have found that when a mouse leave the chart this causes a Major regenerations of the chart
I am assuming this is to clean up any tooltips that might be left
It still does this even if Tooltip::Never is used.
I had this problem 3 years ago but it was fixed but its crept back over the years

I am now having make assumptions and edit the source code to get a usable program.

I have included the Source changes I have made and I would be very gratefull if you can think of a stock way to stop OnMouseLeave eventualy causing chart.Dirty to be set to true thus causing major recreation of chart.

UltraWinChart.cs: line 6016 - current 2010.1 SR1 source release

protected override void OnMouseLeave(EventArgs e)
        {
            //MAC this causes massive rebuild of charts when mouse leaves the chart
            //MAC we can not have this it makes our program unusable :¬(
            //MAC even if you have "Tooltips:Never" maybe it should check this
            //MAC From what i can see "this.Tool" is not major part of the ultrachart system
            //MAC damage happens here.. because of "IChartComponent.Invalidate" makes chart.Dirty
            //Infragistics2.Win.UltraWinChart.v10.1.dll!Infragistics.Win.UltraWinChart.UltraChart.Infragistics.UltraChart.Resources.IChartComponent.Invalidate(Infragistics.UltraChart.Shared.Styles.CacheLevel cacheLevel = LayerLevelCache) Line 5498    C#
            //Infragistics2.Win.UltraWinChart.v10.1.dll!Infragistics.Win.UltraWinChart.InteractionTool.InvalidateView(Infragistics.UltraChart.Shared.Styles.CacheLevel cacheLevel = LayerLevelCache) Line 187 + 0xf bytes    C#
            //Infragistics2.Win.UltraWinChart.v10.1.dll!Infragistics.Win.UltraWinChart.DefaultTool.Stop() Line 192 + 0xd bytes    C#
               //Infragistics2.Win.UltraWinChart.v10.1.dll!Infragistics.Win.UltraWinChart.UltraChart.Tool.set(Infragistics.Win.UltraWinChart.IInteractionTool value = null) Line 5890 + 0xf bytes    C#
            //Infragistics2.Win.UltraWinChart.v10.1.dll!Infragistics.Win.UltraWinChart.UltraChart.OnMouseLeave(System.EventArgs e = {System.EventArgs}) Line 6018 + 0xa bytes    C#
            //
            //this.Tool = null;

            base.OnMouseLeave(e);
        }

Many thanks as usual :¬)