$Id: RowHeaderColumnModel.java,v 1.0 2005/09/25 jDynTable@gmx.de $
The RowHeaderColumnModel is used by the Jdyntable to store all the
columns that correspond to the row header of the table.
Constructs a new RowHeaderModel
using the given ProxyTableModel, which holds the EntityList
and EntityTableColumnModel, which define the rows and the
columns of the table respectively.