Hi Frans,
Here is the problem: open TemplateBindings viewer, select non-default bindings from combobox at the top. Then edit those bindings (in new modal window of course), save them - you will return to TemplateBindings viewer. So far so good.
The problem is that bindings you selected from combobox are reset to the default (first) one.
It would be better to retain bindings I selected before.