How to show and hide Button when i created.

[vudvpro]

- Create Layout:

void Schedule::createLayout()
{
	QVBoxLayout *mainLayout = new QVBoxLayout(); 
	QGridLayout *daysLayout = new QGridLayout();
	QWidget *viewport = new QWidget();
	mainLayout->addWidget(viewport);
 
	Token *label = new Token(this);
	label->setAlignment(Qt::AlignLeft);
	QList<Token *> cwList;
        cwList.append(label);
	daysLayout->addWidget(label);
 
 
	for (int i = 0; i < 5; i++ )
	{
		Button *label = new Button(this);
		label->setAlignment(Qt::AlignLeft);
		label->setOptimumSize(299, 15);
		label->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Fixed);
		SchedulesList.append(label);
		daysLayout->addWidget(label);
	}
 
	daysLayout->setSpacing(1);
	daysLayout->setContentsMargins(0,0,0,0);
	daysLayout->setAlignment(Qt::AlignCenter);
	viewport->setLayout(daysLayout);
 
	mainLayout->setSpacing(0);
	mainLayout->setContentsMargins(0,0,0,0);
	mainLayout->setAlignment(Qt::AlignCenter);
	setLayout(mainLayout);
}

void Schedule::createLayout()
{
	QVBoxLayout *mainLayout = new QVBoxLayout(); 
	QGridLayout *daysLayout = new QGridLayout();
	QWidget *viewport = new QWidget();
	mainLayout->addWidget(viewport);

	Token *label = new Token(this);
	label->setAlignment(Qt::AlignLeft);
	QList<Token *> cwList;
        cwList.append(label);
	daysLayout->addWidget(label);


	for (int i = 0; i < 5; i++ )
	{
		Button *label = new Button(this);
		label->setAlignment(Qt::AlignLeft);
		label->setOptimumSize(299, 15);
		label->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Fixed);
		SchedulesList.append(label);
		daysLayout->addWidget(label);
	}

	daysLayout->setSpacing(1);
	daysLayout->setContentsMargins(0,0,0,0);
	daysLayout->setAlignment(Qt::AlignCenter);
	viewport->setLayout(daysLayout);

	mainLayout->setSpacing(0);
	mainLayout->setContentsMargins(0,0,0,0);
	mainLayout->setAlignment(Qt::AlignCenter);
	setLayout(mainLayout);
}

To copy to clipboard, switch view to plain text mode 

- i want update layout can show and hide button.
i use:

QLayoutItem *Item = NULL;
for (int i = 0; i < 5; i++)
		{
			Item = daysLayout->itemAt(i);
			if (Item)
			{
				Item->widget()->hide();
				Item->widget()->adjustSize(); 
				Item->widget()->updateGeometry();
			}
		}
		daysLayout->update();

QLayoutItem *Item = NULL;
for (int i = 0; i < 5; i++)
		{
			Item = daysLayout->itemAt(i);
			if (Item)
			{
				Item->widget()->hide();
				Item->widget()->adjustSize(); 
				Item->widget()->updateGeometry();
			}
		}
		daysLayout->update();

To copy to clipboard, switch view to plain text mode 

But i can't show them again.
How to do this??
Many thank!!!