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I have tree. Each tree node is a radio button. Nodes can be expanded/collapsed by clicking the disclosure icon which is a grey triangle. Some radio buttons are disabled.
If a radio button is disabled, should clicking it expand/collapse the node. In other words, should it act as a secondary toggle button?
I'm considering this because the user wouldn't have to move the pointer over the disclosure icon to toggle the node.
Each control should have its own separate interaction role. It will be clear and familiar for a user.
Assigning "tricky" behavior makes interaction unclear, because rules are hidden from user. Clear and familiar interaction, which is aligned with user expectations, based on previous experience:
a) reduces errors,
b) makes learning curve low,
c) increaces efficiency and effectivenes.
In other words, brings good UX.
Also don't forget to set item labels to check radios.
