_elementImplClassColumn = new TableColumn(_tblElementMappings, SWT.NONE);
_elementImplClassColumn.setText("Implementation class");
_elementImplClassColumn.setWidth((int)(tableWidth * 0.5));
_elementMappingsModel = new ElementMappingsModel(_model.getElementMappings());
_elementMappingsModel.addListener(new BeanListTableModelListener() {
public void add(Object bean) {
_model.fireModelChanged();
}