Glad to help.

As requested, I have uploaded my Tee Chart Test Application: "TeeChartTestApp.zip" The ".ShowEditor" call works on the computer on which the program is compiled, but when running/installing on other PCs, it does not work. However, the "Steema.TeeChart.Editor.Show(tGraph)" call does work. (Program wa...

I have come across the same problem.
However, I have found a solution that seems to work on a test application I whipped up to help me resolve the issue.

Try this:
where "tGraph" is the name of your TeeChart Graphing object.

Hope this helps, and good luck.