added and documented SetEscapeId()

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@35689 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/common/dlgcmn.cpp

@@ -108,7 +108,8 @@ void wxDialogBase::Init()
 {
     m_returnCode = 0;
     m_affirmativeId = wxID_OK;
-    
+    m_escapeId = wxID_ANY;
+
     // the dialogs have this flag on by default to prevent the events from the
     // dialog controls from reaching the parent frame which is usually
     // undesirable and can lead to unexpected and hard to find bugs