/** Enables or disables tree mode. */
public void setTreeModeEnabled(boolean enabled) {
BaseEditorPanel opanel = _panel;
remove(opanel);
add(
_panel =
enabled
? new TreeEditorPanel(_ctx, opanel.getAncestors(), opanel.getOmitColumns())
: new EditorPanel(
_ctx,
EditorPanel.CategoryMode.PANELS,
opanel.getAncestors(),
opanel.getOmitColumns()));
_panel.addChangeListener(this);
_panel.setObject(opanel.getObject());
revalidate();
}