the basic idea of following code is to create a collection of widgets and add the collection to a scroll area,each collection has at least 2 labels describing it's contents
Qt Code: 
  1. #ifndef collection_class
  2. #define collection_class
  3. #include <QWidget>
  4. #include <QLabel>
  5. #include <QVBoxLayout>
  6. #include <QGridLayout>
  7. class collection:public QWidget
  8. {
  9.       private:
  10.  
  11.  
  12.                   static QVBoxLayout* mainLayout;
  13.                   QGridLayout innerLayout	      
  14. 	              QLabel caption;                         
  15.  
  16. 	public:
  17.                    QSize sizeHint();	       
  18.                    collection(QWidget *parent,QString collectionName,QString collectionCaption);                    
  19.                    static QVBoxLayout* returnMainLayout();
  20.                    QLabel triClick;
  21.  
  22. };
  23. #endif
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Qt Code: 
  1. #include "collection.h"
  2.  
  3. collection::collection(QWidget *parent, QString collectionName, QString collectionCaption)
  4.  :QWidget(parent)
  5. {
  6.  
  7.    innerLayout.setProperty("name",collectionName);
  8.    triClick.setText(collectionName);   
  9.    caption.setText(collectionCaption);
  10.    innerLayout.addWidget(&triClick,0,0);
  11.    innerLayout.addWidget(&caption,0,1);
  12.    mainLayout->addLayout(&innerLayout);    
  13.  
  14. }
  15. static QVBoxLayout* collection::returnMainLayout() 
  16. {
  17.   return mainLayout;
  18. }
  19. QSize collection::sizeHint()
  20. {
  21.   return QSize(100,200);
  22. }
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Qt Code: 
  1. #ifndef scroll_class
  2. #define scroll_class
  3. #include "collection.h"
  4. #include <QScrollArea>
  5. class scroll:public QScrollArea
  6. {
  7.   public:
  8.       scroll(QWidget *parent=0);	           
  9.       collection* addCollection(QString collectionName, QString collectionLabel);
  10.       bool addWidget(QString collectionName, QWidget* object2Add,QString objectIdentifier);
  11.       QSize sizeHint();
  12. };
  13. #endif
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Qt Code: 
  1. #include "scroll.h"
  2. #include <QDebug>
  3. scroll::scroll(QWidget *parent)
  4.  :QScrollArea(parent)
  5.  {
  6.  
  7.   setMaximumSize(200,80);
  8.       //         ****  point of interest  *****
  9.   collection* collectionTmpPtr=new collection(this, "", "");
  10.   collectionTmpPtr=new collection(this, "shoot", "wow");
  11.   collectionTmpPtr=new collection(this, "shoot3S", "wow");
  12.   collectionTmpPtr=new collection(this, "shoot3S", "wow");
  13.   collectionTmpPtr=new collection(this, "shoot3S", "wow");
  14.   collectionTmpPtr=new collection(this, "shoot3S", "wow");
  15.   collectionTmpPtr=new collection(this, "shoot3S", "wow");
  16.   collectionTmpPtr=new collection(this, "shoot3S", "wow");
  17.   collectionTmpPtr=new collection(this, "shoot3S", "wow");
  18.   collectionTmpPtr=new collection(this, "shoot3S", "wow");
  19.  
  20.   QWidget * widget=new QWidget(parent);            
  21.   VBoxLayout *mainLayout = collection::returnMainLayout() ;             
  22.   widget->setLayout(mainLayout);                
  23.   setWidget(widget);  
  24.  
  25.  }
  26. collection* scroll::addCollection(QString collectionName,QString collectionLabel)
  27. {
  28.   collection* collectionTmpPtr=new collection(this, collectionName, collectionLabel);
  29.   return collectionTmpPtr;
  30. }
  31. bool scroll::addWidget(QString collectionName, QWidget* object2Add, QString objectIdentifier)
  32. {
  33.  
  34.   QVBoxLayout *mainLayout = collection::returnMainLayout();
  35.  
  36.  for (int i = 0; i <  mainLayout->count(); ++i)
  37.       {
  38.  
  39.          QLayout* item=mainLayout->itemAt(i)->layout();
  40.         if (item !=0)  //if item is a layout                  
  41.            if (item->property("name")==collectionName) //if that's the collection user is looking for to add items to
  42.              {
  43.                object2Add->setProperty ("name",objectIdentifier);
  44.                QGridLayout* newItem=static_cast<QGridLayout*>(item);                            
  45.                newItem->addWidget(object2Add,newItem->count()-1,0);               
  46.                return true;               
  47.              }
  48.  
  49.       }
  50. return false;
  51.  
  52. }
  53. QSize scroll::sizeHint()
  54. {
  55.  return QSize(100,80);
  56. }
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Qt Code: 
  1. #include <QtGui>
  2. #include <QApplication>
  3. #include "scroll.h"
  4. QVBoxLayout* collection::mainLayout=new QVBoxLayout;
  5.  
  6. int main(int argc, char *argv[])
  7. {
  8.  
  9.     QApplication a(argc, argv);    
  10.     QWidget windows;
  11.     scroll test(&windows);    
  12.     QVBoxLayout layout;   
  13.      test.addCollection("salam2","2");
  14.      test.addCollection("salam3","2");
  15.      test.addCollection("salam2","1");
  16.      test.addCollection("salam4","3");
  17.      test.addCollection("salam5","5");
  18.      test.addCollection("salam2","2");
  19.      test.addCollection("salam3","2");
  20.      test.addCollection("salam2","1");
  21.      test.addCollection("salam4","3");
  22.      test.addCollection("salam5","5");
  23.      test.addCollection("salam2","1");
  24.      test.addCollection("salam4","3");
  25.      test.addCollection("salam5","5");  
  26.  
  27.  
  28.     windows.setLayout(&layout);
  29.     windows.show();
  30.  
  31.     return a.exec();
  32. }
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now the problem is that when i add collections in scroll constructor everything is fine like
following which i have used my custom scroll widget alone with 2 other widgets:

but when i add collections using add collection method which performs the same job,i have sizing issues like following:

the picture above shows my widget when some of the collections are added in scroll widget constructor and some of them are added in main.cpp using addCollection method,
if I add all collections in main then i would have NO collections being seen at all(i think they get zero size so they are not shown) i have played with sizepolicies and minimumSize methods but no luck,I'm Stuck,please help