diff --git a/src/AutoConnectAux.cpp b/src/AutoConnectAux.cpp
index 8471fc3..fffa880 100644
--- a/src/AutoConnectAux.cpp
+++ b/src/AutoConnectAux.cpp
@@ -23,7 +23,6 @@
  * the behavior of AutoConnectSubmit.
  */
 const char AutoConnectAux::_PAGE_AUX[] PROGMEM = {
-  "{{EXIT_HANDLE}}"
   "{{HEAD}}"
   "<title>{{AUX_TITLE}}</title>"
   "<style type=\"text/css\">"
@@ -40,7 +39,7 @@ const char AutoConnectAux::_PAGE_AUX[] PROGMEM = {
   "{{MENU_AUX}}"
   "{{MENU_POST}}"
   "<div class=\"base-panel\"><div class=\"aux-page\">"
-  "<form id='_aux' method=\"post\">"
+  "<form id='_aux' method=\"post\" onsubmit=\"return false;\">"
   "<ul class=\"noorder\">"
   "{{AUX_ELEMENT}}"
   "</ul>"
@@ -78,6 +77,8 @@ const String AutoConnectCheckbox::toHTML(void) const {
   String  html;
 
   html = String(FPSTR("<input type=\"checkbox\" name=\"")) + name + String(FPSTR("\" value=\"")) + value + String("\"");
+  if (checked)
+    html += String(FPSTR(" checked"));
   if (label.length())
     html += String(" id=\"") + name + String("\"><label for=\"") + name + String("\">") + label + String(FPSTR("</label"));
   html += String(FPSTR("><br>"));
@@ -238,10 +239,23 @@ const String AutoConnectAux::_insertElement(PageArgument& args) {
   AC_UNUSED(args);
   String  body = String();
 
+  if (_handler)
+    if (_order & AC_EXIT_AHEAD) {
+      AC_DBG("CB %s\n", uri());
+      body += _handler(args);
+    }
+
   for (std::size_t n = 0; n < _addonElm.size(); n++) {
     AutoConnectElement& addon = _addonElm[n];
     body += addon.toHTML();
   }
+
+  if (_handler)
+    if (_order & AC_EXIT_LATER) {
+      AC_DBG("CB %s\n", uri());
+      body += _handler(args);
+    }
+
   return body;
 }
 
@@ -271,7 +285,6 @@ PageElement* AutoConnectAux::_setupPage(String uri) {
       elm = new PageElement();
       // Construct the auxiliary page
       elm->setMold(_PAGE_AUX);
-      elm->addToken(PSTR("EXIT_HANDLE"), std::bind(&AutoConnectAux::_exitHandle, this, std::placeholders::_1));
       elm->addToken(PSTR("HEAD"), std::bind(&AutoConnect::_token_HEAD, mother, std::placeholders::_1));
       elm->addToken(PSTR("AUX_TITLE"), std::bind(&AutoConnectAux::_injectTitle, this, std::placeholders::_1));
       elm->addToken(PSTR("CSS_BASE"), std::bind(&AutoConnect::_token_CSS_BASE, mother, std::placeholders::_1));
@@ -305,14 +318,3 @@ const String AutoConnectAux::_injectMenu(PageArgument& args) {
     menuItem += _next->_injectMenu(args);
   return menuItem;
 }
-
-/**
- *  The 'on' handler callback behavior wrapper.
- */
-const String AutoConnectAux::_exitHandle(PageArgument& args) {
-  if (_handler) {
-    AC_DBG("CB %s\n", uri());
-    _handler(args);
-  }
-  return "";
-}
diff --git a/src/AutoConnectAux.h b/src/AutoConnectAux.h
index 2af04d3..62e7051 100644
--- a/src/AutoConnectAux.h
+++ b/src/AutoConnectAux.h
@@ -58,11 +58,12 @@ class AutoConnectButton : public AutoConnectElement {
  */
 class AutoConnectCheckbox : public AutoConnectElement {
  public:
-  explicit AutoConnectCheckbox(const char* name = "", const char* value = "", const char* label = "") : AutoConnectElement(name, value), label(String(label)) {}
+  explicit AutoConnectCheckbox(const char* name = "", const char* value = "", const char* label = "", const bool checked = false) : AutoConnectElement(name, value), label(String(label)), checked(checked) {}
   ~AutoConnectCheckbox() {}
   const String  toHTML(void) const;
 
   String  label;    /**< A label for a subsequent input box */
+  bool    checked;  /**< The element should be pre-selected */
 };
 
 /**
@@ -157,7 +158,14 @@ typedef std::vector<std::reference_wrapper<AutoConnectElement>> AutoConnectEleme
 
 // A type of callback function when  AutoConnectAux page requested.
 //typedef std::function<void(AutoConnectAux&, PageArgument&)> AuxHandleFuncT;
-typedef std::function<void(PageArgument&)>  AuxHandlerFunctionT;
+typedef std::function<String(PageArgument&)>  AuxHandlerFunctionT;
+
+// A type for the order in which callback functions are called.
+typedef enum {
+  AC_EXIT_AHEAD = 1,
+  AC_EXIT_LATER = 2,
+  AC_EXIT_BOTH = 3
+} AutoConnectExitOrder_t;
 
 /**
  *  A class that handles an auxiliary page with AutoConnectElement
@@ -178,7 +186,7 @@ class AutoConnectAux : public PageBuilder {
   bool  release(const String name);                                     /**< Release an AutoConnectElement */
   void  setTitle(const char* title) { _title = String(title); }         /**< Set a title of the auxiliary page. */
   void  menu(const bool post) { _menu = post; }                         /**< Set or reset the display as menu item for this aux. */
-  void  on(const AuxHandlerFunctionT handler) { _handler = handler; }   /**< Set user handler */
+  void  on(const AuxHandlerFunctionT handler, const AutoConnectExitOrder_t order = AC_EXIT_AHEAD) { _handler = handler; _order = order; }   /**< Set user handler */
 
  protected:
   void  _concat(AutoConnectAux& aux);
@@ -187,7 +195,6 @@ class AutoConnectAux : public PageBuilder {
   const String  _insertElement(PageArgument& args);
   const String  _injectTitle(PageArgument& args) { return _title; }
   const String  _injectMenu(PageArgument& args);
-  const String  _exitHandle(PageArgument& args);
 
   String  _title;                             /**< A title of the page */
   bool    _menu;                              /**< Switch for menu displaying */
@@ -195,6 +202,7 @@ class AutoConnectAux : public PageBuilder {
   std::unique_ptr<AutoConnectAux> _next;      /**< Auxiliary pages chain list */
   std::unique_ptr<AutoConnect>    _ac;        /**< Hosted AutoConnect instance */
   AuxHandlerFunctionT   _handler;             /**< User sketch callback function when AutoConnectAux page requested. */
+  AutoConnectExitOrder_t  _order;             /**< The order in which callback functions are called. */
 
   static const char _PAGE_AUX[] PROGMEM;      /**< Auxiliary page template */
 
diff --git a/src/AutoConnectPage.cpp b/src/AutoConnectPage.cpp
index ee70fea..d9c2a1b 100644
--- a/src/AutoConnectPage.cpp
+++ b/src/AutoConnectPage.cpp
@@ -477,7 +477,7 @@ const char  AutoConnect::_ELM_MENU_PRE[] PROGMEM = {
 };
 
 const char  AutoConnect::_ELM_MENU_AUX[] PROGMEM = {
-  "{{AUX_MENU}}" 
+  "{{AUX_MENU}}"
 };
 
 const char  AutoConnect::_ELM_MENU_POST[] PROGMEM = {
@@ -712,7 +712,8 @@ const char  AutoConnect::_PAGE_SUCCESS[] PROGMEM = {
   "</body>"
   "</html>"
 };
- /**< A response page for connection failed. */
+
+/**< A response page for connection failed. */
 const char  AutoConnect::_PAGE_FAIL[] PROGMEM = {
   "{{HEAD}}"
   "<title>AutoConnect statistics</title>"