Tree node custom header type not working?

I'm using the new Tree Node widget (which is a very useful addition to the modeler) but it seems i can;t get the custom header type working? The documentation says it should open a new region when set to custom (see below) but it doesn't in my modeler Header type – defines the type of the header Default: Text When set to Text, you can configure the Header caption property When set to Custom, a new region becomes available where you can configure the header through other widgets
1 answers

Hi Bob,

It's working fine for me, I am getting a new region where I can place widgets in the Tree header. Are you looking in the right place?

Checked in 9.6.0.