public LocalizedLabelPropertyDescriptor(LocalizedLabelCollection coll, int idx) :
     base("#" + idx, null)
 {
     collection = coll;
     index      = idx;
 }
 public LocalizedLabelPropertyDescriptor(LocalizedLabelCollection coll, int idx) :
     base("#" + idx, null)
 {
     collection = coll;
     index = idx;
 }