gridlayout unwanted display

[PstdEr]

Hi below is my application
LoadApplication loads a set of pushbuttons in Gridlayout
nss1.jpeg is the window once LoadApplication is completed.



#include "mainwindow.h"
#include <QtGui>
class QCalendarWidget;

void MainWindow::LoadApplication()
{
int a[] = {0,0,0,1,1,1,2,2,2};
int b[] = {3,6,9,3,6,9,3,6,9};

if(button[0]){
delete button[0],button[0]=NULL;
delete previewGroupBox,previewGroupBox=NULL;
delete previewLayout,previewLayout=NULL;
delete calendar,calendar=NULL;

if (Gh)
delete Gh,Gh=NULL;
}

if(!Gh){
Gh = new QGridLayout();
display -> setLayout(Gh);
}

for(int i = 0; i < 9; i++)
{
button[i] = new QPushButton(QIcon("qt4.png"),NULL,this);
button[i] -> setIconSize(button[i]->rect().size());
Gh -> addWidget(button[i],a[i],b[i],1,3);
button[i] -> setGeometry(a[i],b[i],100,100);
button[i] -> setMaximumSize(100,100);
connect(button[i],SIGNAL(clicked()),this,SLOT(fun()));
}
}



the fun is used to delete the layouts and buttons so that the calendar can be launched.
so nss2.jpeg is window after this fun is called.

but here i observe some strange thing .
even after deleting buttons i can see some buttons in the background.
in the attached jpeg this can be seen clearly..

i need help in understanding , from where those buttons are coming.



//void MainWindow ::fun(int i)
void MainWindow ::fun()
{

for(int i=0;i<9;i++)
if(button[i])
delete button[i],button[i]=NULL;
if (Gh)
delete Gh,Gh=NULL;

Gh = new QGridLayout;
display->setLayout(Gh);
createPreviewGroupBox();
Gh->addWidget(previewGroupBox, 0, 0);

button[0] = new QPushButton(QIcon("qt4.png"),NULL,this);
Gh -> addWidget(button[0],3,2,1,3);
button[0] -> setGeometry(3,2,100,100);
button[0] -> setMaximumSize(50,50);
connect(button[0],SIGNAL(clicked()),this,SLOT(LoadApplication()));

}



this is for standard calendar widget



void MainWindow::createPreviewGroupBox()
{
previewGroupBox = new QGroupBox(tr("Preview"));

calendar = new QCalendarWidget;
calendar->setMinimumDate(QDate(1900, 1, 1));
calendar->setMaximumDate(QDate(3000, 1, 1));
calendar->setGridVisible(true);

connect(calendar, SIGNAL(currentPageChanged(int,int)),
this, SLOT(reformatCalendarPage()));

previewLayout = new QGridLayout;
previewLayout->addWidget(calendar, 0, 0, 0);//Qt::AlignCenter);
previewGroupBox->setLayout(previewLayout);
}

[ChrisW67]

You really should look at QStackedWidget and save yourself a bunch of work.