i created scroll area using designer and adding line edit in run time, when button clicked….
But scroll area is not expanding(scroll bars are inactive even though i set scrollbarAlways on)
please help me…
here is my complete code..

mainwindow.h

Qt Code: 
  1. #ifndef MAINWINDOW_H
  2.     #define MAINWINDOW_H
  3.  
  4.     #include <QMainWindow>
  5.  
  6.     namespace Ui {
  7.         class MainWindow;
  8.     }
  9.  
  10.     class MainWindow : public QMainWindow
  11.     {
  12.         Q_OBJECT
  13.  
  14.     public:
  15.         explicit MainWindow(QWidget *parent = 0);
  16.         ~MainWindow();
  17.  
  18.     private slots:
  19.         void on_pushButton_clicked();
  20.  
  21.     private:
  22.         Ui::MainWindow *ui;
  23.     };
  24.  
  25.     #endif // MAINWINDOW_H
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mainwindow.cpp
Qt Code: 
  1. #include "mainwindow.h"
  2.     #include "ui_mainwindow.h"
  3.  
  4.     MainWindow::MainWindow(QWidget *parent) :
  5.         QMainWindow(parent),
  6.         ui(new Ui::MainWindow)
  7.     {
  8.         ui->setupUi(this);
  9.  
  10.  
  11.  
  12.     }
  13.  
  14.     MainWindow::~MainWindow()
  15.     {
  16.         delete ui;
  17.     }
  18.  
  19.  
  20.  
  21.     void MainWindow::on_pushButton_clicked()
  22.     {
  24.  
  25.        ui->gridLayout->addWidget(le);
  26.  
  27.  
  28.     ui->scrollArea->setWidgetResizable(true);
  29.  
  30.     }
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mainwindow.ui

Qt Code: 
  1. <?xml version="1.0" encoding="UTF-8"?>
  2.     <ui version="4.0">
  3.      <class>MainWindow</class>
  4.      <widget class="QMainWindow" name="MainWindow">
  5.       <property name="geometry">
  6.        <rect>
  7.         <x>0</x>
  8.         <y>0</y>
  9.         <width>400</width>
  10.         <height>300</height>
  11.        </rect>
  12.       </property>
  13.       <property name="windowTitle">
  14.        <string>MainWindow</string>
  15.       </property>
  16.       <widget class="QWidget" name="centralWidget">
  17.        <layout class="QVBoxLayout" name="verticalLayout">
  18.         <property name="sizeConstraint">
  19.          <enum>QLayout::SetMinAndMaxSize</enum>
  20.         </property>
  21.         <item>
  22.          <widget class="QScrollArea" name="scrollArea">
  23.           <property name="widgetResizable">
  24.            <bool>true</bool>
  25.           </property>
  26.           <widget class="QWidget" name="scrollAreaWidgetContents">
  27.            <property name="geometry">
  28.             <rect>
  29.              <x>0</x>
  30.              <y>0</y>
  31.              <width>380</width>
  32.              <height>198</height>
  33.             </rect>
  34.            </property>
  35.            <widget class="QWidget" name="">
  36.             <property name="geometry">
  37.              <rect>
  38.               <x>40</x>
  39.               <y>31</y>
  40.               <width>216</width>
  41.               <height>25</height>
  42.              </rect>
  43.             </property>
  44.             <layout class="QGridLayout" name="gridLayout">
  45.              <property name="sizeConstraint">
  46.               <enum>QLayout::SetMinAndMaxSize</enum>
  47.              </property>
  48.              <item row="0" column="0">
  49.               <widget class="QPushButton" name="pushButton_2">
  50.                <property name="text">
  51.                 <string>PushButton</string>
  52.                </property>
  53.               </widget>
  54.              </item>
  55.              <item row="0" column="1">
  56.               <widget class="QLineEdit" name="lineEdit"/>
  57.              </item>
  58.             </layout>
  59.            </widget>
  60.           </widget>
  61.          </widget>
  62.         </item>
  63.         <item>
  64.          <widget class="QPushButton" name="pushButton">
  65.           <property name="text">
  66.            <string>PushButton</string>
  67.           </property>
  68.          </widget>
  69.         </item>
  70.        </layout>
  71.       </widget>
  72.       <widget class="QMenuBar" name="menuBar">
  73.        <property name="geometry">
  74.         <rect>
  75.          <x>0</x>
  76.          <y>0</y>
  77.          <width>400</width>
  78.          <height>21</height>
  79.         </rect>
  80.        </property>
  81.       </widget>
  82.       <widget class="QToolBar" name="mainToolBar">
  83.        <attribute name="toolBarArea">
  84.         <enum>TopToolBarArea</enum>
  85.        </attribute>
  86.        <attribute name="toolBarBreak">
  87.         <bool>false</bool>
  88.        </attribute>
  89.       </widget>
  90.       <widget class="QStatusBar" name="statusBar"/>
  91.      </widget>
  92.      <layoutdefault spacing="6" margin="11"/>
  93.      <resources/>
  94.      <connections/>
  95.     </ui>
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