In ModelBuilder, how do you merge all the polygons in an output?

GIS: ArcGIS 10 - ArcView License + Spatial Analysis extension

Have created a simple model like so:

input polygon data/shapefile > select field1="A" > buffer that for 30 metters > output a shapefile (see screenshot).
Attachment 24446

With Editor in ArcMap, those polygons can be selected and hit merge to one polygon.

I've tried to Select all these polygons and use the Merge tool again in the model but it didn't work.

Where shall I go from here to solve the puzzle?

Thanks.

Attached Thumbnails