sidebar conversion tutorial: Get rid of ToolBox backgound(s).

In the header files, they are Windows, with Background in the name; in the
.cxx, they are created using CreateToolBoxBackground() function.

Change-Id: If24db0c4a59b702f31481a4018c8c19383d01216

sc/source/ui/sidebar/AlignmentPropertyPanel.cxx

@@ -52,11 +52,9 @@ AlignmentPropertyPanel::AlignmentPropertyPanel(
     : Control(
         pParent,
             ScResId(RID_PROPERTYPANEL_SC_ALIGNMENT)),
-      mpTBHorizontalBackground(ControlFactory::CreateToolBoxBackground(this)),
       mpTBHorizontal(ControlFactory::CreateToolBox(
               mpTBHorizontalBackground.get(),
               ScResId(TBX_HORIZONTAL_ALIGNMENT))),
-      mpTBVerticalBackground(ControlFactory::CreateToolBoxBackground(this)),
       mpTBVertical(ControlFactory::CreateToolBox(
               mpTBVerticalBackground.get(),
               ScResId(TBX_VERTICAL_ALIGN))),

sc/source/ui/sidebar/AlignmentPropertyPanel.hxx

@@ -59,9 +59,7 @@ public:
 
 private:
     //ui controls
-    ::boost::scoped_ptr<Window>                 mpTBHorizontalBackground;
     ::boost::scoped_ptr< ToolBox >              mpTBHorizontal;
-    ::boost::scoped_ptr<Window>                 mpTBVerticalBackground;
     ::boost::scoped_ptr< ToolBox >              mpTBVertical;
     ::boost::scoped_ptr< FixedText >            mpFTLeftIndent;
     ::boost::scoped_ptr< MetricField >          mpMFLeftIndent;