Unable to show a hidden form in Visual C++ -

hey guys hoping shed insight why i'm unable toggle between showing , hiding form.

quizmenu.h i've been working on simple quiz game application proceeds through series of questions in form, of well, forms! there main menu user can exit application:

    private: system::void exit_click(system::object^  sender, system::eventargs^  e) {     //exits application     quizmenu::close(); } 

or proceed first question hide main menu , open question1 form:

    private: system::void enter_click(system::object^  sender, system::eventargs^  e) {     question1 ^question1 = gcnew question1();     question1->show();     this->hide();  } 

question1.h question1 prompts user answer question choosing between 2 possible answers through buttons.

correct.h correct answer hides current form , opens indicates answer correct:

    private: system::void answer1_click(system::object^  sender, system::eventargs^  e) {             correct ^correct = gcnew correct();             correct->show();             this->hide();      } 

the second same except opens form indicates user incorrect:

   private: system::void answer2_click(system::object^  sender, system::eventargs^  e) {             incorrect ^incorrect = gcnew incorrect();             incorrect->show();             this->hide();      } 

both forms allow user proceed next question clicking button hides correct/incorrect forms.

question2.h i'm having difficulty. question2 form unable reopen correct/incorrect forms question1 did. unable access main menu. when trying reopen correct.h form error 'question2': undeclared identifier. suspect has fact i've hidden these forms, or #includes either in wrong order or incorrect.

my question2.h form looks sans design code because it's quite lengthy:

    #pragma once     #include "correct.h"      namespace quizgame {  using namespace system; using namespace system::componentmodel; using namespace system::collections; using namespace system::windows::forms; using namespace system::data; using namespace system::drawing;  /// <summary> /// summary question2 /// </summary> public ref class question2 : public system::windows::forms::form { public:     question2(void)     {         initializecomponent();         //         //todo: add constructor code here         //     }  protected:     /// <summary>     /// clean resources being used.     /// </summary>     ~question2()     {         if (components)         {             delete components;         }     } private: system::windows::forms::label^  label1; private: system::windows::forms::button^  answer1correct; private: system::windows::forms::button^  answer2incorrect; private: system::windows::forms::button^  answer3incorrect; private: system::windows::forms::button^  answer4incorrect; private: system::windows::forms::picturebox^  picturebox1; protected:  private:     /// <summary>     /// required designer variable.     /// </summary>     system::componentmodel::container ^components;       #pragma endregion private: system::void answer3incorrect_click(system::object^  sender, system::eventargs^  e) { }  private: system::void answer2incorrect_click(system::object^  sender, system::eventargs^  e) { }  private: system::void answer1correct_click(system::object^  sender, system::eventargs^  e) {     correct ^correct = gcnew correct();     correct->show();     this->hide(); } private: system::void answer4incorrect_click(system::object^  sender, system::eventargs^  e) { }    };    } 

my apologies if difficult read, first submission. i'm happy post more code if isn't enough (in interest of clarity tried keep minimum).