Custom Widget inside a QVboxLayout

[jacek]

Yes, If I use standard widgets I can see all of them!

Hmm... What are the values of sizePolicy and minimumSize properties?

[nemesis]

I have solved the problem!!!

Here was the code before I fixed it:

QWidget* privateLayoutWidget = new QWidget( this, "layout2" );
    privateLayoutWidget->setGeometry( QRect( 0, 0, 642, 400 ) );
    layout2 = new QVBoxLayout( privateLayoutWidget, 11, 6, "layout2");
 
    textLabel3 = new QLabel( privateLayoutWidget, "textLabel3" );
    textLabel3->setMinimumSize( QSize( 640, 16 ) );
    textLabel3->setAlignment( int( QLabel::AlignCenter ) );
    layout2->addWidget( textLabel3 );
 
    plt = new plotter();
    layout2->addWidget( plt);

QWidget* privateLayoutWidget = new QWidget( this, "layout2" );
    privateLayoutWidget->setGeometry( QRect( 0, 0, 642, 400 ) );
    layout2 = new QVBoxLayout( privateLayoutWidget, 11, 6, "layout2");

    textLabel3 = new QLabel( privateLayoutWidget, "textLabel3" );
    textLabel3->setMinimumSize( QSize( 640, 16 ) );
    textLabel3->setAlignment( int( QLabel::AlignCenter ) );
    layout2->addWidget( textLabel3 );

    plt = new plotter();
    layout2->addWidget( plt);

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I did not set the parent when I created the plotter instance.
I corrected this code to:

QWidget* privateLayoutWidget = new QWidget( this, "layout2" );
    privateLayoutWidget->setGeometry( QRect( 0, 0, 642, 400 ) );
    layout2 = new QVBoxLayout( privateLayoutWidget, 11, 6, "layout2");
 
    textLabel3 = new QLabel( privateLayoutWidget, "textLabel3" );
    textLabel3->setMinimumSize( QSize( 640, 16 ) );
    textLabel3->setAlignment( int( QLabel::AlignCenter ) );
    layout2->addWidget( textLabel3 );
 
    plt = new plotter(privateLayoutWidget);
    plt->setMinimumSize(640,200);
    layout2->addWidget( plt);

QWidget* privateLayoutWidget = new QWidget( this, "layout2" );
    privateLayoutWidget->setGeometry( QRect( 0, 0, 642, 400 ) );
    layout2 = new QVBoxLayout( privateLayoutWidget, 11, 6, "layout2");

    textLabel3 = new QLabel( privateLayoutWidget, "textLabel3" );
    textLabel3->setMinimumSize( QSize( 640, 16 ) );
    textLabel3->setAlignment( int( QLabel::AlignCenter ) );
    layout2->addWidget( textLabel3 );

    plt = new plotter(privateLayoutWidget);
    plt->setMinimumSize(640,200);
    layout2->addWidget( plt);

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And now it works!
I'm reading some texts to know why is it necessary to specify the parent widget...

Thanks a lot!