diff --git a/samples/controls/controls.cpp b/samples/controls/controls.cpp
index 0d8ecf7f94..f06c9955bf 100644
--- a/samples/controls/controls.cpp
+++ b/samples/controls/controls.cpp
@@ -1081,15 +1081,19 @@ void MyPanel::OnListBoxButtons( wxCommandEvent &event )
             }
         case ID_LISTBOX_SEL_NUM:
             {
-                m_listbox->SetSelection( 2 );
-                m_listboxSorted->SetSelection( 2 );
+                if (m_listbox->GetCount() > 2)
+                    m_listbox->SetSelection( 2 );
+                if (m_listboxSorted->GetCount() > 2)
+                    m_listboxSorted->SetSelection( 2 );
                 m_lbSelectThis->WarpPointer( 40, 14 );
                 break;
             }
         case ID_LISTBOX_SEL_STR:
             {
-                m_listbox->SetStringSelection( _T("This") );
-                m_listboxSorted->SetStringSelection( _T("This") );
+                if (m_listbox->FindString(_T("This")) > -1)
+                    m_listbox->SetStringSelection( _T("This") );
+                if (m_listboxSorted->FindString(_T("This")) > -1)
+                    m_listboxSorted->SetStringSelection( _T("This") );
                 m_lbSelectNum->WarpPointer( 40, 14 );
                 break;
             }
diff --git a/src/msw/button.cpp b/src/msw/button.cpp
index 7fcfa743d4..2763c945b0 100644
--- a/src/msw/button.cpp
+++ b/src/msw/button.cpp
@@ -415,7 +415,8 @@ static void DrawButtonText(HDC hdc,
     COLORREF colOld = SetTextColor(hdc, col);
     int modeOld = SetBkMode(hdc, TRANSPARENT);
 
-    ::DrawText(hdc, text, text.length(), pRect, DT_CENTER | DT_VCENTER);
+    // Note: we must have DT_SINGLELINE for DT_VCENTER to work.
+    ::DrawText(hdc, text, text.length(), pRect, DT_SINGLELINE | DT_CENTER | DT_VCENTER);
 
     SetBkMode(hdc, modeOld);
     SetTextColor(hdc, colOld);