QCalendarWidget - height rows

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hi
i am trying to set row height in QCalendarWidget
example. i want to have 3rd week of month size bigger than other. any ideas ... how can it be done ?

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i try this code:

QCalendarWidgetMy(QWidget *parent=0) : QCalendarWidget (parent)
	  {
 
	    view2 = qFindChild<QTableView *>(this);
 
	  }
 
       mycalendar = new QCalendarWidgetMy(this);
       mycalendar->view2->resizeColumnsToContents();
 
	mycalendar->view2->verticalHeader()->setDefaultSectionSize(51);
	//mycalendar->view2->setShowGrid(true); // works
 
 
	mycalendar->view2->setRowHeight ( 2, 51 );

QCalendarWidgetMy(QWidget *parent=0) : QCalendarWidget (parent)
	  {
	  	
	    view2 = qFindChild<QTableView *>(this);
	  
	  }
	
       mycalendar = new QCalendarWidgetMy(this);
       mycalendar->view2->resizeColumnsToContents();
	
	mycalendar->view2->verticalHeader()->setDefaultSectionSize(51);
	//mycalendar->view2->setShowGrid(true); // works
	

	mycalendar->view2->setRowHeight ( 2, 51 );

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but this not working