public SymbolBlockCollectionPropertyDescriptor(SymbolBlockCollection coll, int idx)
     :
     base("#" + idx.ToString(), null)
 {
     this.collection = coll;
     this.index      = idx;
 }
 public SymbolBlockCollectionPropertyDescriptor(SymbolBlockCollection coll, int idx)
     : base("#" + idx.ToString(), null)
 {
     this.collection = coll;
     this.index = idx;
 }