public void insert(final PWidget widget, final PWidget tabWidget, final int beforeIndex) {
// Detach new child.
widget.removeFromParent();
getChildren().insert(widget, beforeIndex);
// Adopt.
adopt(widget);
final Add addWidget = new Add(widget.getID(), getID());
addWidget.put(PROPERTY.BEFORE_INDEX, beforeIndex);
addWidget.put(PROPERTY.TAB_WIDGET, tabWidget.getID());
getUIContext().stackInstruction(addWidget);
}
