How can I emerge two handles (BCPs) out a corner point in retrospect

Glyphs
1

After I made a corner point in Fontlab. How can I convert this corner point retrospectively to a round curve point? In FontLab e.g. I can click a corner point again and when I hold down the “alt“ key (Mac) I can emerge one or a second handle to get a round curve. How can I make this in Glyph? Thanks for reply!

2

alt+click on a segment? don’t click the point.

3

That’s works fine! Thanks a lot!