FWL refcounts never incremented (part 2).

xfa/src/fwl/src/lightwidget/pushbutton.cpp

Index: xfa/src/fwl/src/lightwidget/pushbutton.cpp
diff --git a/xfa/src/fwl/src/lightwidget/pushbutton.cpp b/xfa/src/fwl/src/lightwidget/pushbutton.cpp
index 24050c86662a8ab7913c830d4c9655a51b9f400f..a3df89106db402a8764769ffcf584f99c0abb3e2 100644
--- a/xfa/src/fwl/src/lightwidget/pushbutton.cpp
+++ b/xfa/src/fwl/src/lightwidget/pushbutton.cpp
@@ -14,15 +14,15 @@ FWL_ERR CFWL_PushButton::Initialize(const CFWL_WidgetProperties* pProperties) {
   if (pProperties) {
     *m_pProperties = *pProperties;
   }
-  m_pIface = new IFWL_PushButton;
-  FWL_ERR ret =
-      ((IFWL_PushButton*)m_pIface)
-          ->Initialize(m_pProperties->MakeWidgetImpProperties(&m_buttonData),
-                       nullptr);
-  if (ret == FWL_ERR_Succeeded) {
-    CFWL_Widget::Initialize();
+  nonstd::unique_ptr<IFWL_PushButton> pPushButton(IFWL_PushButton::Create(
+      m_pProperties->MakeWidgetImpProperties(&m_buttonData), nullptr));
+  FWL_ERR ret = pPushButton->Initialize();
+  if (ret != FWL_ERR_Succeeded) {
+    return ret;
   }
-  return ret;
+  m_pIface = pPushButton.release();
+  CFWL_Widget::Initialize();
+  return FWL_ERR_Succeeded;
 }
 FWL_ERR CFWL_PushButton::GetCaption(CFX_WideString& wsCaption) {
   wsCaption = m_buttonData.m_wsCaption;