A family of Microsoft relational database management systems designed for ease of use.
Setproperty is a macro action
However, the code you have should work. Except I would not put it in a different event. You are mixing VBA and macro for the same control. Not the best idea. Neither is accepting the default name for your controls.
If you select Setproperty where it says Add new Action, then select the Value property and set it to Null. that should work.