How does line indentation work?

[aimcosoftware]

Trying to use Lines(n).Indentation property, but it doesn't seem to have any effect.
I'm adding the code in the Insert / Delete events when the line count has changed.
Any help would be appreciated.

[aimcosoftware]

Apologies, seems that if I call it from CharAdded, it works as expected.
Not the ideal place, but I'll play some more.