Adding Error Output To Custom Source Component

Hi all,
I saw a couple of other posts here on this topic, but none quite got to my issue.
I'm trying to add error output to a custom source component (not a script, a custom component). The samples all seem to deal with transform components, and my issues seem to be unique to source components.

I have the following code related to error handling ...

Public Overloads Overrides Sub ProvideComponentProperties()

...

Dim output As IDTSOutput90 = ComponentMetaData.OutputCollection.New

output.Name = OUTPUTCOLUMNNAME


output.ExternalMetadataColumnCollection.IsUsed = True

ComponentMetaData.UsesDispositions = True

output.ErrorRowDisposition = DTSRowDisposition.RD_NotUsed

output.ErrorOrTruncationOperation = "Something got truncated or blew up"

Dim errorOutput As IDTSOutput90 = ComponentMetaData.OutputCollection.New

errorOutput.Name = ERRORCOLUMNNAME

errorOutput.IsErrorOut = True

...
End Sub


Public Overloads Overrides Sub ReinitializeMetaData()


Dim output As IDTSOutput90 = ComponentMetaData.OutputCollection(OUTPUTCOLUMNNAME)

Dim outColumn As IDTSOutputColumn90 = output.OutputColumnCollection.New


outColumn.Name = strName

outColumn.SetDataTypeProperties(DataType.DT_I4, 0, 0, 0, 0)



Dim metadataColumn As IDTSExternalMetadataColumn90 = output.ExternalMetadataColumnCollection.New


metadataColumn.Name = outColumn.Name

metadataColumn.DataType = outColumn.DataType

metadataColumn.Precision = outColumn.Precision

metadataColumn.Length = outColumn.Length

metadataColumn.Scale = outColumn.Scale

metadataColumn.CodePage = outColumn.CodePage

outColumn.ExternalMetadataColumnID = metadataColumn.ID


outColumn.ErrorRowDisposition = DTSRowDisposition.RD_NotUsed

outColumn.ErrorOrTruncationOperation = "Something Truncated!"

outColumn.TruncationRowDisposition = DTSRowDisposition.RD_NotUsed

Dim errorOutput As IDTSOutput90 = ComponentMetaData.OutputCollection(ERRORCOLUMNNAME)

Dim errorColumn As IDTSOutputColumn90 = errorOutput.OutputColumnCollection.New

errorColumn.Name = outColumn.Name

errorColumn.SetDataTypeProperties(DataType.DT_I4, 0, 0, 0, 0)
...
End Sub

The confusions I have are:
a) the stock advanced properties editor (I haven't provided a custom one) doesn't seem to "realize" that I have an error output, so provides no method to configure. I am believing it would need to know which Output columns can have their error/truncation redirected. I'd have thought setting ErrorRowDisposition on my output column would have been enough to trigger this ??
b) since I don't have any means of configuring, not surprisingly, when I try to connect my error output, designer complains that, "Ths error output cannot receive any error rows. This occurs for several reasons: Input columns or output columns are not yet defined. Error handling is not supported by the component. Error handling is not configured for the component."
c) UsesDispoistions would seem to be appropriate only for a transform component

Thanks for reading, and appreciate any help or pointers.
Bill