Why doesn't the checkbox check?

I have a JTable that has a column of (Boolean.class). So it displays a checkbox.
The public boolean isCellEditable( int row, int column ) returns true.
The public final Class getColumnClass( int column ) returns Boolean.class
There is no default renderer overiding it. ( i.e. I never set setDefaultRenderer() )
So, I don't know why it won't set the checkbox to 'checked' state when I click on it.

This shows the checkboxes are always false, so I guess I'll have to overwrite the default setValueAt() method...
public void setAllSelected( boolean flag )
    int rowSize = getRowCount();
    System.out.println( "RowSize: "+rowSize+", boolean: "+flag );
    for( int row = 0; row < rowSize; row++ )
      setValueAt( new Boolean( flag ), row, XML_Table.CHECK_COL );
      fireTableDataChanged();
      Boolean b = (Boolean)getValueAt(row, XML_Table.CHECK_COL);
      System.out.println( "Is Checkbox checked: "+b.booleanValue() );
}

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