Create instance

instanceProto.CreateInst = function (objtype,x,y,_layer)
{
    var layer = (typeof _layer == "number")?
                this.runtime.getLayerByNumber(_layer):
                (typeof _layer == "string")?
                this.runtime.getLayerByName(_layer):
                _layer;
 
    // call system action: Create instance
    cr.system_object.prototype.acts.CreateObject.call(
        this.runtime.system,
        objtype,
        layer,
        x,
        y
    );
   
    return objtype.getFirstPicked();  // return the created instance
};

Reference