diff --git a/reactos/subsys/win32k/include/painting.h b/reactos/subsys/win32k/include/painting.h
index 72a75641a3f..217efadcc92 100644
--- a/reactos/subsys/win32k/include/painting.h
+++ b/reactos/subsys/win32k/include/painting.h
@@ -9,6 +9,8 @@
 
 VOID FASTCALL
 IntValidateParent(PWINDOW_OBJECT Child, HRGN ValidRegion);
+VOID FASTCALL
+IntValidateSiblings(PWINDOW_OBJECT Child, HRGN ValidRegion);
 BOOL FASTCALL
 IntRedrawWindow(PWINDOW_OBJECT Wnd, const RECT* UpdateRect, HRGN UpdateRgn, ULONG Flags);
 BOOL FASTCALL
diff --git a/reactos/subsys/win32k/ntuser/painting.c b/reactos/subsys/win32k/ntuser/painting.c
index 8341227dd90..ef7eeb287e5 100644
--- a/reactos/subsys/win32k/ntuser/painting.c
+++ b/reactos/subsys/win32k/ntuser/painting.c
@@ -16,7 +16,7 @@
  *  along with this program; if not, write to the Free Software
  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  *
- *  $Id: painting.c,v 1.62 2004/01/17 15:18:25 navaraf Exp $
+ *  $Id: painting.c,v 1.63 2004/01/18 08:29:31 navaraf Exp $
  *
  *  COPYRIGHT:        See COPYING in the top level directory
  *  PROJECT:          ReactOS kernel
@@ -270,8 +270,7 @@ IntPaintWindows(PWINDOW_OBJECT Window, ULONG Flags)
  */
 
 VOID FASTCALL
-IntInvalidateWindows(PWINDOW_OBJECT Window, HRGN hRgn, ULONG Flags,
-   BOOL ValidateParent)
+IntInvalidateWindows(PWINDOW_OBJECT Window, HRGN hRgn, ULONG Flags)
 {
    INT RgnType;
    BOOL HadPaintMessage, HadNCPaintMessage;
@@ -364,15 +363,6 @@ IntInvalidateWindows(PWINDOW_OBJECT Window, HRGN hRgn, ULONG Flags,
       Window->Flags &= ~WINDOWOBJECT_NEED_INTERNALPAINT;
    }
 
-   /*
-    * Validate parent covered by region
-    */
-
-   if (ValidateParent)
-   {
-      IntValidateParent(Window, Window->UpdateRegion);
-   }
-
    /*
     * Split the nonclient update region.
     */
@@ -418,7 +408,7 @@ IntInvalidateWindows(PWINDOW_OBJECT Window, HRGN hRgn, ULONG Flags,
                NtGdiOffsetRgn(hRgnTemp,
                   Window->WindowRect.left - Child->WindowRect.left,
                   Window->WindowRect.top - Child->WindowRect.top);
-               IntInvalidateWindows(Child, hRgnTemp, Flags, FALSE);
+               IntInvalidateWindows(Child, hRgnTemp, Flags);
                NtGdiDeleteObject(hRgnTemp);
             }
             IntReleaseWindowObject(Child);
@@ -546,13 +536,7 @@ IntRedrawWindow(PWINDOW_OBJECT Window, const RECT* UpdateRect, HRGN UpdateRgn,
 
    if (Flags & (RDW_INVALIDATE | RDW_VALIDATE | RDW_INTERNALPAINT | RDW_NOINTERNALPAINT))
    {
-      IntInvalidateWindows(Window, hRgn, Flags, TRUE);
-   } else
-   if (Window->UpdateRegion != NULL && (Flags & (RDW_ERASENOW | RDW_UPDATENOW)))
-   {
-      /* Validate parent covered by region. */
-      IntValidateParent(Window, Window->UpdateRegion);
-      IntValidateParent(Window, Window->NCUpdateRegion);
+      IntInvalidateWindows(Window, hRgn, Flags);
    }
 
    /*
diff --git a/reactos/subsys/win32k/ntuser/window.c b/reactos/subsys/win32k/ntuser/window.c
index 4899675a294..b0ae7ebeeee 100644
--- a/reactos/subsys/win32k/ntuser/window.c
+++ b/reactos/subsys/win32k/ntuser/window.c
@@ -16,7 +16,7 @@
  *  along with this program; if not, write to the Free Software
  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  */
-/* $Id: window.c,v 1.176 2004/01/17 15:18:25 navaraf Exp $
+/* $Id: window.c,v 1.177 2004/01/18 08:29:31 navaraf Exp $
  *
  * COPYRIGHT:        See COPYING in the top level directory
  * PROJECT:          ReactOS kernel
@@ -1555,7 +1555,6 @@ NtUserDestroyWindow(HWND Wnd)
     }
 
   /* Recursively destroy owned windows */
-#if 0 /* FIXME */
   if (! isChild)
     {
       for (;;)
@@ -1573,6 +1572,10 @@ NtUserDestroyWindow(HWND Wnd)
 	      for (ChildHandle = Children; *ChildHandle; ++ChildHandle)
 		{
 		  Child = IntGetWindowObject(*ChildHandle);
+		  if (Child == NULL)
+		    {
+		      continue;
+		    }
 		  if (Child->Owner != Window)
 		    {
 		      continue;
@@ -1599,7 +1602,6 @@ NtUserDestroyWindow(HWND Wnd)
 	    }
 	}
     }
-#endif
 
   if (!IntIsWindow(Wnd))
     {
@@ -3112,23 +3114,6 @@ NtUserSetWindowPos(
     int cy,
     UINT uFlags)
 {
-   PWINDOW_OBJECT WindowObject;
-
-   WindowObject = IntGetWindowObject(hWnd);
-   if (WindowObject == NULL)
-   {
-      SetLastWin32Error(ERROR_INVALID_WINDOW_HANDLE);
-      return FALSE;
-   }
-
-   if (WindowObject->Style & WS_CHILD)
-   {
-      X += WindowObject->Parent->ClientRect.left;
-      Y += WindowObject->Parent->ClientRect.top;
-   }
-
-   IntReleaseWindowObject(WindowObject);
-
    return WinPosSetWindowPos(hWnd, hWndInsertAfter, X, Y, cx, cy, uFlags);
 }
 
diff --git a/reactos/subsys/win32k/ntuser/winpos.c b/reactos/subsys/win32k/ntuser/winpos.c
index b2263c2941a..06f51ff30a9 100644
--- a/reactos/subsys/win32k/ntuser/winpos.c
+++ b/reactos/subsys/win32k/ntuser/winpos.c
@@ -16,7 +16,7 @@
  *  along with this program; if not, write to the Free Software
  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  */
-/* $Id: winpos.c,v 1.81 2004/01/17 15:18:25 navaraf Exp $
+/* $Id: winpos.c,v 1.82 2004/01/18 08:29:31 navaraf Exp $
  *
  * COPYRIGHT:        See COPYING in the top level directory
  * PROJECT:          ReactOS kernel
@@ -268,6 +268,8 @@ WinPosMinMaximize(PWINDOW_OBJECT WindowObject, UINT ShowFlag, RECT* NewPos)
 	  {
 	    WinPosGetMinMaxInfo(WindowObject, &Size, &InternalPos->MaxPos, 
 				NULL, NULL);
+	    DPRINT1("Maximize: %d,%d %dx%d\n",
+	       InternalPos->MaxPos.x, InternalPos->MaxPos.y, Size.x, Size.y);
 	    if (WindowObject->Style & WS_MINIMIZE)
 	      {
 		WindowObject->Style &= ~WS_MINIMIZE;
@@ -757,11 +759,6 @@ WinPosSetWindowPos(HWND Wnd, HWND WndInsertAfter, INT x, INT y, INT cx,
    WinPos.cx = cx;
    WinPos.cy = cy;
    WinPos.flags = flags;
-   if (Window->Style & WS_CHILD)
-   {
-      WinPos.x -= Window->Parent->ClientRect.left;
-      WinPos.y -= Window->Parent->ClientRect.top;
-   }
 
    WinPosDoWinPosChanging(Window, &WinPos, &NewWindowRect, &NewClientRect);