Hi Michael,
TestComplete does not currently support the Scintilla component. You can submit a feature request for Scintilla support on this page:
http://support.smartbear.com/products/more-info/testcomplete-survey/Meanwhile, there're several options to automate this control.
First of all, depending on your application type, compiling the application with debug information can expose the native methods and properties of the Scintilla component to TestComplete. In this case, you'll be able to use these methods and properties in your tests. For details on the compiler settings, please refer to the
TestComplete documentation.
Also, you can automate Scintilla operations by sending the
SCI_ Windows messages to the Scintilla component using the WinAPI.SendMessage method in TestComplete.
For other possible automation options, please refer to this article:
Ways to Interact With Application ObjectsI hope this helps!