Init VC:VmwareDistributedVirtualSwitch in scriptable task

Hi,

I have a little question : I want to modify default workflow to create vdPortGroup.

I want to remove input "dvSwitch" (VC:VmwareDistributedVirtualSwitch and replace it with "site" (String).

In the input, i want force user to select a site (Ex. Site A or Site B) and he cannot browse vCenter infrastructure.

Then, in a scriptable task i test the value selected and create dvportgroup on dvSwitch corresponding.

But i don't know how to initialize the dvSwitch object before to run :

dvPortgroupCreationTask = dvSwitch.addDVPortgroup_Task(specArray);

Regards