Add label to legend

[countersubject]

Hi,
how can I add a label to a legend?

Context: I am tryng to group curves that belong together, and I want to add a label to the legend, then have all the curves listed after that, and then maybe a newline and the next group below. Ex:

Group1: -curve1 -curve2 -curve3
Group2: -curve4 -curve5

etc.
Is this possible? I tried adding dummy curves to get an entry in the legend but they do not appear in the correct order (I added them first, but they appear last).

I'd be very grateful for some hints/advice

PS: using qwt 6.0.1

[Uwe]

One major difference between Qwt 6.1 and 6.0 is the API for the legend, that allows to implement custom legends.
For example have a look at the stockchart example that uses a QTreeView as legend ( there grouping according to the plot item type ).

Uwe

[countersubject]

I know but I can't switch now.
Is there still a way....maybe?