How to trigger Signature Field event ("Sign with a digital ID" pop up) from javascript?

Okay.. I have custom meun javascriptr, which is placed inside "C:\Program Files (x86)\Adobe\Acrobat DC\Acrobat\Javascripts" folder. But I still don't know what to call from javascript to open "Sign with a digital ID" pop up . 

Here is the code snap, which is to find signature control in pdf. Based on the control type "Sign with a digital ID" pop up should open using javascript.

for (var fieldNumber = 0; fieldNumber < this.numFields; fieldNumber++) {
    var controlType = this.getField(this.getNthFieldName(fieldNumber)).type;
    if (controlType === "signature") {
        //Here, I know PDF have signature control and its name
        //My next work is to trigger event to open "Sign with a digital ID" pop up
        this.getField(this.getNthFieldName(fieldNumber)).setFocus();
    }
}