In case if the main button bar has paths containing environment variables:
and the button bar is changed before the WM_SETTINGCHANGE, then needs to manually open Button Bar dialog and press OK to trigger button bar icons reload. The point is the `MYVAR` here can change externally and TC does not reload the icons by the WM_SETTINGCHANGE message.[ButtonBar]
button=%MYVAR%\blabla.ico
I think TC should reload the button bar because the button bar paths can contain environment variables.