Adding DeriveColumn Component syntax

Yesterday I have to dig into my old repository to add a derived column into a package, eventually I was able to figured that out, but here it is just as a remainder that somethings are like zombies, don't matter how many times to shoot them if is not in the head they come back :-)

 //Add Derive Column for BatchId
                PipelineWrapper.IDTSComponentMetaData100 icmdDeriveRawColumn = AddComponentMetadata(RawDataFlow, "AddBatchIdColumn");
                icmdDeriveRawColumn.ComponentClassID = "DTSTransform.DerivedColumn";
                PipelineWrapper.CManagedComponentWrapper mcwDeriveRawColumn = icmdDeriveRawColumn.Instantiate();
                mcwDeriveRawColumn.ProvideComponentProperties();
                
                icmdDeriveRawColumn.InputCollection[0].ExternalMetadataColumnCollection.IsUsed = false;
                icmdDeriveRawColumn.InputCollection[0].HasSideEffects = false;
                
                Reinitiaze(mcwDeriveRawColumn);
                PipelineWrapper.IDTSOutputColumn100 BatchIdCol = icmdDeriveRawColumn.OutputCollection[0].OutputColumnCollection.New();
                BatchIdCol.Name = "BatchId";
                BatchIdCol.SetDataTypeProperties(RuntimeWrapper.DataType.DT_WSTR,8,0,0,0);
                BatchIdCol.ExternalMetadataColumnID = 0;
                BatchIdCol.ErrorRowDisposition = PipelineWrapper.DTSRowDisposition.RD_FailComponent;
                BatchIdCol.TruncationRowDisposition = PipelineWrapper.DTSRowDisposition.RD_FailComponent;
                PipelineWrapper.IDTSCustomProperty100 BatchColProp = BatchIdCol.CustomPropertyCollection.New();
                BatchColProp.Name = "Expression";
                BatchColProp.Value = "@[User::strBatchId]";
                BatchColProp = BatchIdCol.CustomPropertyCollection.New();
                BatchColProp.Name = "FriendlyExpression";
                BatchColProp.Value = "@[User::strBatchId]";