LabVIEW VI scripting : property : change to Write

Hi. When using a "property node" to access an object's property, the property field is created in "read mode" by default. With the LabVIEW UI, a simple right click / "change to write"  operation allows to change it in "write mode" :
  

But I couldn't find a way to do this with VI Scripting. Here is a practical example, with a vi script (attached) creating a property node accessing a property named AVALUE from a .NET DLL (attached too):

And here is the result:

How am I supposed to change AVALUE property value into "write"  through VI scripting?