Tutorial "Creating Python OOT with gr-modtool" Switch selector at runtime

[Info]

System: GnuRadio 2.10.1.1 and Python 3.10.4 on Ubuntu 22_04

 

Hello,

in the course of familiarization with gnuradio I've successful finished the
tutorial

"Creating Python OOT with gr-modtool".

There is a parameter "Selector" to select the working of the block.

 

Now,  I added a QT-Toggle switch to the flowgraph to control the
addSubSelect block at RUNTIME.

But it don't work. My question is:

Where can I find information about that and what is necessary to get it
work? 

 

Thanks

Karlheinz