valgrind: memory leaks

Change-Id: If47170b323cb0b48b7cf2182ecbecfac575a6118

sw/source/uibase/sidebar/PagePropertyPanel.cxx

@@ -224,6 +224,11 @@ void PagePropertyPanel::dispose()
     m_aSwPageColControl.dispose();
     m_aSwPagePgMetricControl.dispose();
 
+    maColumnPopup.dispose();
+    maSizePopup.dispose();
+    maMarginPopup.dispose();
+    maOrientationPopup.dispose();
+
     PanelLayout::dispose();
 }