Access widget inside the QMainWindow centralwidget

[graciano]

Hi
I'm trying to connect a button that is inside a widget(myCentralWidget). This widget is set as the QMainWindow central widget.
This is an example:

#include "mainwindow.h"
#include "ui_mainwindow.h"
 
MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    widget = new myCentralWidget(this);
    setCentralWidget(widget);
    // ...
}

#include "mainwindow.h"
#include "ui_mainwindow.h"

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    widget = new myCentralWidget(this);
    setCentralWidget(widget);
    // ...
}

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All classes are created using Qt Designer Form class from Qt Creator: MainWindow and myCentralWidget.
How do i connect a button that is inside the ui of the myCentralWidget to make something happen in the qmainwindow?
Thanks