The problem is that these editors are for the old TBGRAButton, now its TBCButton and the properties has changed.
Bummer. Thanks for the info anyway.
You can use the object inspector, unfortunately it doesnt have live preview for other states than the normal state of the button.
You can save to file and load from file TBCButtons, it uses standard LCL code to do so. Plus the text file is human readable.
Edit: I downloaded BGRAControls 1.2.1.0 and yes, it has the button editor but it doesn't compile with the newest BGRAControls, as well seems by the screenshot that it just downloads a png image of the button, so nothing special about it.