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-- a/o.n.swing.outline/src/org/netbeans/swing/etable/ColumnSelectionPanel.java
++ b/o.n.swing.outline/src/org/netbeans/swing/etable/ColumnSelectionPanel.java
Object transformed = table.transformValue (etc);
String dName;
if (transformed == etc || transformed == null) {
dName = etc.getHeaderValue ().toString ();
dName = table.getColumnDisplayName(etc.getHeaderValue ().toString ());
} else {
dName = transformed.toString ();
}