vRO - How to get by code if an action is used ?

Hi all

I built more than 600 actions in vRO modules and I would like to know if exists a simple way to check if an action is used (in a workflow or workflow presentation or in the code of another action).

I didn't find anything in vRO API or in plugin to do that.

In fact I would like to perform a "Find elements that use this element" for each action.

Does anyone have any ideas ?

Thanks

Jacques