Hi,u try this below code
//action method.
void XXXX::XXX()
{
action_New = new QAction("&New", ui->treeWidget);
action_Open = new QAction("&Open", ui->treeWidget);
//add the code at slots
connect(action_New, SIGNAL(triggered()), this, SLOT(on_action_New_triggered()));
connect(action_Open, SIGNAL(triggered()), this, SLOT(on_action_Open_triggered()));
ui->treeWidget->addAction(action_New);
ui->treeWidget->addAction(action_Open);
ui->treeWidget->setContextMenuPolicy(Qt::ActionsContextMenu);
}
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