kill off top line in an RTB

[WoF]

I testet line deleting in an rtb which has multiple colored lines. Everything worked as expected.

When adding lines, the appending is already done by SelStart = NuText.
Otherwise I used the same code to add lines to the rtb.

I send you the rtb playing form I used.
Change the filename in the Form_Load() to your own file.
The right window shows the rich text commands. Maybe you can spot what happens...