Mapping columns in custom Destination component

I am working on a destination component where the columns in the destination are already set. I want to give the user the option to map columns, similar to the way the Excel destination component does it. So, the Available Input Columns could be mapped to Available Destination Columns. The Available Input Columns would come from a connection from some other component (either a source or a transformation component), and the Available Destination Columns would be generated from the Data Source.

Is there a way to do this without creating a custom ui?

Yes, you can get this for free in the advanced UI, if you store your Available Destination Columns to the ExternalMetadataColumnCollection on the destination input and set IsUsed flag on this collection to true.

HTH.

|||Man, I suspected it had to do with the external metadata columns, but I couldn't get them to show in the UI. Setting the IsUsed property to "true" was the answer. Thanks a lot Bob.