How to resize a widget inside my centralWidget()?

[gboelter]

It may have a layout but you are not adding your widget to it.

wysota, you are the greatest!!!!

I've added one line to my code and now it's working.

frameHome = new QWidget( myMainWindow->centralWidget() );
myMainWindow->gridLayout->addWidget(frameHome, 0, 0, 1, 1);
setupUi( frameHome );

frameHome = new QWidget( myMainWindow->centralWidget() );
myMainWindow->gridLayout->addWidget(frameHome, 0, 0, 1, 1);
setupUi( frameHome );

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Thanks again for giving me the right idea.

Have a nice day.