Hard to read the text of Default Button within a Popup Widget.

#include <QApplication>
#include <QDialogButtonBox>
#include <QPushButton>
#include <QVBoxLayout>
#include <QWidget>
#include <QDebug>

namespace
{
	class Popover final
	:	public QWidget
	{
	public:
		Popover( QWidget * inParent )
		:	QWidget( inParent )
		{
			setWindowFlags( windowFlags() | Qt::Popup );
			setMinimumSize( 300, 100 );

			auto * buttonBox = new QDialogButtonBox( this );
			auto chooseButton = new QPushButton( "Choose", this );
			auto * cancelButton = new QPushButton( "Cancel", this );
			buttonBox->addButton( chooseButton, QDialogButtonBox::AcceptRole );
			buttonBox->addButton( cancelButton, QDialogButtonBox::RejectRole );

			auto * layout = new QVBoxLayout;
			layout->addWidget( buttonBox );
			setLayout( layout );

			connect( chooseButton, &QPushButton::clicked, [this]{ hide(); } );
			connect( cancelButton, &QPushButton::clicked, [this]{ hide(); } );
		}
	};

	class MainWidget : public QWidget
	{
	public:
		MainWidget( QWidget * inParent ) : QWidget( inParent )
		{
			setWindowTitle("Custom FocusFrame Example");
			setGeometry(100, 100, 400, 200);
			
			auto * buttonBox = new QDialogButtonBox( this );
			auto button = new QPushButton( "Open PopOver", this );
			buttonBox->addButton( button, QDialogButtonBox::AcceptRole );
			
			auto popover = new Popover(this);
			
			// Create a layout
			auto layout = new QVBoxLayout(this);
			layout->addWidget(buttonBox);

			connect( button, &QPushButton::clicked, [popover]{ popover->show();} );
		}
	};
}

int main(int argc, char *argv[])
{
	QApplication app(argc, argv);
	
	// Create the main widget
	auto mainWidget = new MainWidget(nullptr);
	mainWidget->show();

	return app.exec();
}