Reuse wxMenu::SendEvent() from wxFrameBase::ProcessCommand().

Not only this avoids code duplication but it also fixes wrong code in
wxFrameBase version as it set the event object incorrectly to the frame itself
instead of setting it to the menu.

Added event object check to the menu events unit test.

Closes #1595.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@71114 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

tests/menu/menu.cpp

@@ -116,6 +116,9 @@ private:
 
     wxArrayString m_menuLabels;
 
+    // The menu containing the item with MenuTestCase_Bar id.
+    wxMenu* m_menuWithBar;
+
     DECLARE_NO_COPY_CLASS(MenuTestCase)
 };
 
@@ -155,6 +158,7 @@ void MenuTestCase::CreateFrame()
 
     PopulateMenu(helpMenu, "Helpmenu item ", itemcount);
     helpMenu->Append(MenuTestCase_Bar, "Bar\tF1");
+    m_menuWithBar = helpMenu;
     helpMenu->AppendSubMenu(subMenu, "Sub&menu", "Test a submenu");
 
     // +2 for "Foo" and "Bar", +2 for the 2 submenus
@@ -464,5 +468,13 @@ void MenuTestCase::Events()
 
     const wxCommandEvent& ev = handler.GetEvent();
     CPPUNIT_ASSERT_EQUAL( static_cast<int>(MenuTestCase_Bar), ev.GetId() );
+
+    wxObject* const src = ev.GetEventObject();
+    CPPUNIT_ASSERT( src );
+
+    CPPUNIT_ASSERT_EQUAL( "wxMenu",
+                          wxString(src->GetClassInfo()->GetClassName()) );
+    CPPUNIT_ASSERT_EQUAL( static_cast<wxObject*>(m_menuWithBar),
+                          src );
 #endif // wxUSE_UIACTIONSIMULATOR
 }