Resizing the rectangular blob of UML lifeline objects

[Mirko Vukovic <mirko vukovic gmail com>]

Hi,

I could not figure out how to vertically resize the rectangular part
of the UML's lifeline object.

Clicking on the anchors, I can move it up and down as a whole, but not
change its vertical extent.

This is on 0.97.1 on windows.

Is this a feature or a bug?

Thanks,

Mirko