It is not keyed from a Layer Key. It is hard coded into a style-level display override on each style.
So you can do one of the following:
1. Change the layer name in the source files.
2. If you want to keep the layer name, but simply have it be all captial letters, put the layer, with all capital letters, in your template file.
3. Change the layer name to all capital letters, using one of the methods noted above, after the layer is imported.
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David Koch
Autodesk Discussion Group Facilitator
Using ADT 2004 at work; access to 2005, 2006, 2007 & 2008 at home