TreeColumn value = new TreeColumn(tree, SWT.NONE);
value.setText(UIText.ConfigurationEditorComponent_ValueColumnHeader);
value.setWidth(250);
new TreeViewerColumn(tv, value)
.setEditingSupport(new EditingSupport(tv) {
protected void setValue(Object element, Object newValue) {
Entry entry = (Entry) element;
if (!entry.value.equals(newValue)) {
entry.changeValue(newValue.toString());