viewer.setLabelProvider(new ExportResourceLabelProvider());
viewer.setAutoExpandLevel(3);
final String crs="CRS"; //$NON-NLS-1$
viewer.setColumnProperties(new String[]{"name",crs}); //$NON-NLS-1$
viewer.setCellEditors(new CellEditor[]{new TextCellEditor(tree), new CRSDialogCellEditor(tree)});
viewer.setCellModifier(new ICellModifier(){
public boolean canModify( Object element, String property ) {
return true;
}