Never mind, I found it.. didn't realise the Color Band has a StartLine and EndLine aggregated in it. This seems to work (tried in the ColorBandDrag sampler app):
this.colorBand1.StartLine.ColorLineClickTolerance = 20;
this.colorBand1.EndLine.ColorLineClickTolerance = 20;

Hi TeeChart forum folks, I'm in need of a Color Band Drag where the upper and lower sizing grip areas are larger than a few pixels height, owing to the chart being used on an HMI touch screen application in a rugged dynamic environment where the operator may be using gloves or otherwise not have the...

Thanks, that fixed the problem.

I've upgraded to this release, and now when I try to run the Feature Demo application, I get an unhandled exception and can't continue running the app. The exception details are: "Could not load file or assembly 'TeeChart, Version=4.1.2012.1312, Culture=neutral,PublicKey Token=9c8126276c77bdb' or on...