4 files changed, 12 insertions, 11 deletions
diff --git a/vcl/source/control/button.cxx b/vcl/source/control/button.cxx
index 1fffd4809750..7861656edf90 100644
--- a/vcl/source/control/button.cxx
+++ b/vcl/source/control/button.cxx
@@ -96,13 +96,11 @@ Button::Button( WindowType nType ) :
 Button::~Button()
 {
     dispose();
+    delete mpButtonData;
 }
 
 void Button::dispose()
 {
-    delete mpButtonData;
-    mpButtonData = NULL;
-
     Control::dispose();
 }
 
@@ -543,7 +541,7 @@ sal_uInt16& Button::ImplGetButtonState()
 
 sal_uInt16 Button::ImplGetButtonState() const
 {
-    return mpButtonData->mnButtonState;
+    return mpButtonData ? mpButtonData->mnButtonState : 0;
 }
 
 void Button::ImplSetSymbolAlign( SymbolAlign eAlign )
@@ -1588,7 +1586,8 @@ void PushButton::SetPressed( bool bPressed )
 void PushButton::EndSelection()
 {
     EndTracking( ENDTRACK_CANCEL );
-    if ( ImplGetButtonState() & BUTTON_DRAW_PRESSED )
+    if ( !IsDisposed() &&
+         ImplGetButtonState() & BUTTON_DRAW_PRESSED )
     {
         ImplGetButtonState() &= ~BUTTON_DRAW_PRESSED;
         if ( !mbPressed )
diff --git a/vcl/source/control/tabctrl.cxx b/vcl/source/control/tabctrl.cxx
index 73987a1aafc8..4a89c0f33ca5 100644
--- a/vcl/source/control/tabctrl.cxx
+++ b/vcl/source/control/tabctrl.cxx
@@ -206,9 +206,9 @@ void TabControl::dispose()
     // delete TabCtrl data
     if ( mpTabCtrlData )
     {
-        if( mpTabCtrlData->mpListBox )
-            delete mpTabCtrlData->mpListBox;
+        delete mpTabCtrlData->mpListBox;
         delete mpTabCtrlData;
+        mpTabCtrlData = NULL;
     }
     Control::dispose();
 }
diff --git a/vcl/source/window/accessibility.cxx b/vcl/source/window/accessibility.cxx
index fc3dc74d009d..ca8865618834 100644
--- a/vcl/source/window/accessibility.cxx
+++ b/vcl/source/window/accessibility.cxx
@@ -136,6 +136,8 @@ namespace vcl {
             return pChild->GetAccessible();
     }
     */
+    if ( !mpWindowImpl )
+        return css::uno::Reference< css::accessibility::XAccessible >();
     if ( !mpWindowImpl->mxAccessible.is() && bCreate )
         mpWindowImpl->mxAccessible = CreateAccessible();
 
diff --git a/vcl/source/window/dialog.cxx b/vcl/source/window/dialog.cxx
index 9975c9710558..b34a451cc450 100644
--- a/vcl/source/window/dialog.cxx
+++ b/vcl/source/window/dialog.cxx
@@ -347,8 +347,8 @@ void Dialog::ImplInitDialogData()
     mbOldSaveBack           = false;
     mbInClose               = false;
     mbModalMode             = false;
-    mpContentArea.disposeAndClear();
-    mpActionArea.disposeAndClear();
+    mpContentArea.clear();
+    mpActionArea.clear();
     mnMousePositioned       = 0;
     mpDialogImpl            = new DialogImpl;
 }
@@ -551,8 +551,8 @@ void Dialog::dispose()
 {
     delete mpDialogImpl;
     mpDialogImpl = NULL;
-    mpActionArea.disposeAndClear();
-    mpContentArea.disposeAndClear();
+    mpActionArea.clear();
+    mpContentArea.clear();
     SystemWindow::dispose();
 }