items in view would disappear on scrolling

[sepehr]

I add a QTableView as a tab for QTabWidget using addTab method,when not scrolling is needed everything is fine but as soon as page scrolls some items would disappear,what should i do?(does it have anything to do with repainting the items in the view ?)
for getting the picture more clearly,take a loot at these

with no scrolling:

with scrolling:

[aamer4yu]

How are you populating the tableview ?

[sepehr]

using data function of the model,the data function uses a qsqlquery to retrive data(because of some bugs in sqlModel of qt i coded the model myself)

[aLiEnHeAd]

Do you use WinXP or Vista?
If have a similar problem which occurs only with Qt 4.5.0 and Windows Vista...

[sepehr]

I'm using windows XP,
I just used another simple model to check whether my model is the problem or not

model=new QStandardItemModel (4, 4);
 for (int row = 0; row < 4; ++row) {
     for (int column = 0; column < 4; ++column) {
         QStandardItem *item = new QStandardItem(QString("row %0, column %1").arg(row).arg(column));
         model->setItem(row, column, item);
     }
 }

model=new QStandardItemModel (4, 4);
 for (int row = 0; row < 4; ++row) {
     for (int column = 0; column < 4; ++column) {
         QStandardItem *item = new QStandardItem(QString("row %0, column %1").arg(row).arg(column));
         model->setItem(row, column, item);
     }
 }

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it still has the problem,seemingly sth is wrong with QTabWidget,what am I missing? I also used to show my view using show method and all items are showing while scrolling and works just fine.it's very critical which I get over this,any ideas?