diff --git a/harbour/ChangeLog b/harbour/ChangeLog
index 0653095e09..aa0c878949 100644
--- a/harbour/ChangeLog
+++ b/harbour/ChangeLog
@@ -16,6 +16,16 @@
    The license applies to all entries newer than 2009-04-28.
 */
 
+2012-06-01 08:05 UTC-0800 Pritpal Bedi (bedipritpal@hotmail.com)
+  * contrib/hbqt/qtgui/qth/HBQTableView.qth
+  * contrib/hbqt/qtgui/qth/QHeaderView.qth
+  * contrib/hbqt/qtgui/qth/QListWidgetItem.qth
+  * contrib/hbqt/qtgui/qth/QStatusBar.qth
+  * contrib/hbqt/qtgui/qth/QTextDocument.qth
+  * contrib/hbqt/qtgui/qth/QTreeWidgetItem.qth
+    ! Fixed: constructors for few more classes. 
+      Now contrib/hbxbp/demoxbp.prg shows up at least.
+
 2012-05-31 23:32 UTC-0800 Pritpal Bedi (bedipritpal@hotmail.com)
   * contrib/hbqt/qtgui/qth/QApplication.qth
   * contrib/hbqt/qtgui/qth/QColorDialog.qth
diff --git a/harbour/contrib/hbqt/qtgui/qth/HBQTableView.qth b/harbour/contrib/hbqt/qtgui/qth/HBQTableView.qth
index 7f0ed9130b..354c2aa968 100644
--- a/harbour/contrib/hbqt/qtgui/qth/HBQTableView.qth
+++ b/harbour/contrib/hbqt/qtgui/qth/HBQTableView.qth
@@ -56,7 +56,14 @@ HBQT_GC_FUNC( hbqt_gcMark_HBQTableView )
  */
 HB_FUNC( QT_HBQTABLEVIEW )
 {
-   __HB_RETPTRGC__( new HBQTableView( hbqt_par_QWidget( 1 ) ) );
+   if( hb_pcount() == 1 && hbqt_par_isDerivedFrom( 1, "QWIDGET" ) )
+   {
+      __HB_RETPTRGC__( new HBQTableView( hbqt_par_QWidget( 1 ) ) );
+   }
+   else
+   {
+      __HB_RETPTRGC__( new HBQTableView() );
+   }
 }
 </CODE>
 
diff --git a/harbour/contrib/hbqt/qtgui/qth/QHeaderView.qth b/harbour/contrib/hbqt/qtgui/qth/QHeaderView.qth
index 16d4b8d0b3..73f3278558 100644
--- a/harbour/contrib/hbqt/qtgui/qth/QHeaderView.qth
+++ b/harbour/contrib/hbqt/qtgui/qth/QHeaderView.qth
@@ -26,7 +26,18 @@ New         = pParent
  */
 HB_FUNC( QT_QHEADERVIEW )
 {
-   __HB_RETPTRGC__( new QHeaderView( ( Qt::Orientation ) hb_parni( 1 ), hbqt_par_QWidget( 2 ) ) );
+   if( hb_pcount() == 1 && HB_ISNUM( 1 ) )
+   {
+      __HB_RETPTRGC__( new QHeaderView( ( Qt::Orientation ) hb_parni( 1 ) ) );
+   }
+   else if( hb_pcount() == 2 && HB_ISNUM( 1 ) && hbqt_par_isDerivedFrom( 2, "QWIDGET" ) )
+   {
+      __HB_RETPTRGC__( new QHeaderView( ( Qt::Orientation ) hb_parni( 1 ), hbqt_par_QWidget( 2 ) ) );
+   }
+   else
+   {
+      hb_errRT_BASE( EG_ARG, 9999, NULL, HB_ERR_FUNCNAME, HB_ERR_ARGS_BASEPARAMS );
+   }
 }
 </CODE>
 
diff --git a/harbour/contrib/hbqt/qtgui/qth/QListWidgetItem.qth b/harbour/contrib/hbqt/qtgui/qth/QListWidgetItem.qth
index 0fbe3427aa..d2ff3f9594 100644
--- a/harbour/contrib/hbqt/qtgui/qth/QListWidgetItem.qth
+++ b/harbour/contrib/hbqt/qtgui/qth/QListWidgetItem.qth
@@ -30,7 +30,42 @@ New         = pParent
  */
 HB_FUNC( QT_QLISTWIDGETITEM )
 {
-   __HB_RETPTRGC__( new QListWidgetItem( hbqt_par_QListWidget( 1 ), hb_parni( 2 ) ) );
+   if( hb_pcount() == 1 && hbqt_par_isDerivedFrom( 1, "QLISTWIDGET" ) )
+   {
+      __HB_RETPTRGC__( new QListWidgetItem( hbqt_par_QListWidget( 1 ), hb_parni( 2 ) ) );
+   }
+   else if( hb_pcount() == 1 && hbqt_par_isDerivedFrom( 1, "QLISTWIDGETITEM" ) )
+   {
+      __HB_RETPTRGC__( new QListWidgetItem( *hbqt_par_QListWidgetItem( 1 ) ) );
+   }
+   else if( hb_pcount() == 1 && HB_ISCHAR( 1 ) )
+   {
+      void * pText01 = NULL;
+      __HB_RETPTRGC__( new QListWidgetItem( hb_parstr_utf8( 1, &pText01, NULL ) ) );
+      hb_strfree( pText01 );
+   }
+   else if( hb_pcount() == 2 && HB_ISCHAR( 1 ) && hbqt_par_isDerivedFrom( 2, "QLISTWIDGET" ) )
+   {
+      void * pText01 = NULL;
+      __HB_RETPTRGC__( new QListWidgetItem( hb_parstr_utf8( 1, &pText01, NULL ), hbqt_par_QListWidget( 2 ) ) );
+      hb_strfree( pText01 );
+   }
+   else if( hb_pcount() == 2 && hbqt_par_isDerivedFrom( 1, "QICON" ) && HB_ISCHAR( 2 ) )
+   {
+      void * pText01 = NULL;
+      __HB_RETPTRGC__( new QListWidgetItem( *hbqt_par_QIcon( 1 ), hb_parstr_utf8( 2, &pText01, NULL ) ) );
+      hb_strfree( pText01 );
+   }
+   else if( hb_pcount() == 3 && hbqt_par_isDerivedFrom( 1, "QICON" ) && HB_ISCHAR( 2 ) && hbqt_par_isDerivedFrom( 3, "QLISTWIDGET" ) )
+   {
+      void * pText01 = NULL;
+      __HB_RETPTRGC__( new QListWidgetItem( *hbqt_par_QIcon( 1 ), hb_parstr_utf8( 2, &pText01, NULL ), hbqt_par_QListWidget( 3 ) ) );
+      hb_strfree( pText01 );
+   }
+   else
+   {
+      __HB_RETPTRGC__( new QListWidgetItem() );
+   }
 }
 </CODE>
 
diff --git a/harbour/contrib/hbqt/qtgui/qth/QStatusBar.qth b/harbour/contrib/hbqt/qtgui/qth/QStatusBar.qth
index da4b0a6c28..c256b53616 100644
--- a/harbour/contrib/hbqt/qtgui/qth/QStatusBar.qth
+++ b/harbour/contrib/hbqt/qtgui/qth/QStatusBar.qth
@@ -27,7 +27,14 @@ New         =
  */
 HB_FUNC( QT_QSTATUSBAR )
 {
-   __HB_RETPTRGC__( new QStatusBar( hbqt_par_QWidget( 1 ) ) );
+   if( hb_pcount() == 1 && hbqt_par_isDerivedFrom( 1, "QWIDGET" ) )
+   {
+      __HB_RETPTRGC__( new QStatusBar( hbqt_par_QWidget( 1 ) ) );
+   }
+   else
+   {
+      __HB_RETPTRGC__( new QStatusBar() );
+   }
 }
 </CODE>
 
diff --git a/harbour/contrib/hbqt/qtgui/qth/QTextDocument.qth b/harbour/contrib/hbqt/qtgui/qth/QTextDocument.qth
index c2b4b9572f..d2f873e111 100644
--- a/harbour/contrib/hbqt/qtgui/qth/QTextDocument.qth
+++ b/harbour/contrib/hbqt/qtgui/qth/QTextDocument.qth
@@ -30,7 +30,26 @@ New         =
  */
 HB_FUNC( QT_QTEXTDOCUMENT )
 {
-   __HB_RETPTRGC__( new QTextDocument( hbqt_par_QObject( 1 ) ) );
+   if( hb_pcount() == 1 && hbqt_par_isDerivedFrom( 1, "QObject" ) )
+   {
+      __HB_RETPTRGC__( new QTextDocument( hbqt_par_QObject( 1 ) ) );
+   }   
+   else if( hb_pcount() == 1 && HB_ISCHAR( 1 ) )
+   {
+      void * pText01 = NULL;
+      __HB_RETPTRGC__( new QTextDocument( hb_parstr_utf8( 1, &pText01, NULL ) ) );
+      hb_strfree( pText01 );
+   }   
+   else if( hb_pcount() == 2 && HB_ISCHAR( 1 ) && hbqt_par_isDerivedFrom( 2, "QObject" ) )
+   {
+      void * pText01 = NULL;
+      __HB_RETPTRGC__( new QTextDocument( hb_parstr_utf8( 1, &pText01, NULL ), hbqt_par_QObject( 2 ) ) );
+      hb_strfree( pText01 );
+   }   
+   else
+   {
+      __HB_RETPTRGC__( new QTextDocument() );   
+   }   
 }
 </CODE>
 
diff --git a/harbour/contrib/hbqt/qtgui/qth/QTreeWidgetItem.qth b/harbour/contrib/hbqt/qtgui/qth/QTreeWidgetItem.qth
index 185ac5bb0a..31d66870fa 100644
--- a/harbour/contrib/hbqt/qtgui/qth/QTreeWidgetItem.qth
+++ b/harbour/contrib/hbqt/qtgui/qth/QTreeWidgetItem.qth
@@ -34,14 +34,30 @@ New         = iType
  */
 HB_FUNC( QT_QTREEWIDGETITEM )
 {
-   if( hb_pcount() >= 1 && HB_ISNUM( 1 ) )
+   if( hb_pcount() == 1 && HB_ISNUM( 1 ) )
    {
       __HB_RETPTRGC__( new QTreeWidgetItem( hb_parni( 1 ) ) );
    }
-   else
+   else if( hb_pcount() == 1 && hbqt_par_isDerivedFrom( 1, "QTREEWIDGET" ) )
+   {
+      __HB_RETPTRGC__( new QTreeWidgetItem( hbqt_par_QTreeWidget( 1 ) ) );
+   }
+   else if( hb_pcount() == 1 && hbqt_par_isDerivedFrom( 1, "QTREEWIDGETITEM" ) )
+   {
+      __HB_RETPTRGC__( new QTreeWidgetItem( hbqt_par_QTreeWidgetItem( 1 ) ) );
+   }
+   else if( hb_pcount() == 2 && hbqt_par_isDerivedFrom( 1, "QTREEWIDGET" ) && HB_ISNUM( 2 ) )
    {
       __HB_RETPTRGC__( new QTreeWidgetItem( hbqt_par_QTreeWidget( 1 ), hb_parni( 2 ) ) );
    }
+   else if( hb_pcount() == 2 && hbqt_par_isDerivedFrom( 1, "QTREEWIDGETITEM" ) && HB_ISNUM( 2 ) )
+   {
+      __HB_RETPTRGC__( new QTreeWidgetItem( hbqt_par_QTreeWidgetItem( 1 ), hb_parni( 2 ) ) );
+   }
+   else
+   {
+      __HB_RETPTRGC__( new QTreeWidgetItem() );   
+   }
 }
 </CODE>