Windows Forms и ошибка C2039

#pragma once
//#include "ShowStudentsList1.h"
 
namespace StudentsList {
 
    
 
 
    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 for SelectMenu
    /// </summary>
    public ref class SelectMenu : public System::Windows::Forms::Form
    {
    public:
    public: StudentsList::ShowStudentsList ^ ssl;// = gcnew ShowStudentsList();
        
        SelectMenu(void)
        {
            InitializeComponent();
            //
            //TODO: Add the constructor code here
            //
        }
 
    protected:
        /// <summary>
        /// Clean up any resources being used.
        /// </summary>
        ~SelectMenu()
        {
            if (components)
            {
                delete components;
            }
        }
    private: System::Windows::Forms::Button^  button1;
    protected:
    private: System::Windows::Forms::Button^  button2;
    private: System::Windows::Forms::Button^  button3;
 
    private:
        /// <summary>
        /// Required designer variable.
        /// </summary>
        System::ComponentModel::Container ^components;
 
#pragma region Windows Form Designer generated code
        /// <summary>
        /// Required method for Designer support - do not modify
        /// the contents of this method with the code editor.
        /// </summary>
        void InitializeComponent(void)
        {
            this->button1 = (gcnew System::Windows::Forms::Button());
            this->button2 = (gcnew System::Windows::Forms::Button());
            this->button3 = (gcnew System::Windows::Forms::Button());
            this->SuspendLayout();
            // 
            // button1
            // 
            this->button1->Location = System::Drawing::Point(84, 83);
            this->button1->Name = L"button1";
            this->button1->Size = System::Drawing::Size(201, 58);
            this->button1->TabIndex = 0;
            this->button1->Text = L"Show students list";
            this->button1->UseVisualStyleBackColor = true;
            this->button1->Click += gcnew System::EventHandler(this, &SelectMenu::button1_Click);
            // 
            // button2
            // 
            this->button2->Location = System::Drawing::Point(84, 147);
            this->button2->Name = L"button2";
            this->button2->Size = System::Drawing::Size(201, 58);
            this->button2->TabIndex = 1;
            this->button2->Text = L"Edit students list";
            this->button2->UseVisualStyleBackColor = true;
            // 
            // button3
            // 
            this->button3->Location = System::Drawing::Point(84, 211);
            this->button3->Name = L"button3";
            this->button3->Size = System::Drawing::Size(201, 58);
            this->button3->TabIndex = 2;
            this->button3->Text = L"Show Exit";
            this->button3->UseVisualStyleBackColor = true;
            // 
            // SelectMenu
            // 
            this->AutoScaleDimensions = System::Drawing::SizeF(6, 13);
            this->AutoScaleMode = System::Windows::Forms::AutoScaleMode::Font;
            this->ClientSize = System::Drawing::Size(384, 361);
            this->Controls->Add(this->button3);
            this->Controls->Add(this->button2);
            this->Controls->Add(this->button1);
            this->Name = L"SelectMenu";
            this->Text = L"SelectMenu";
            this->ResumeLayout(false);
 
        }
#pragma endregion
    private: System::Void button1_Click(System::Object^  sender, System::EventArgs^  e) {
                ssl = gcnew ShowStudentsList();
                 ssl->Show();
 
    }
    };
}

Warning 8   warning C4829: Possibly incorrect parameters to function main. Consider 'int main(Platform::Array<Platform::String^>^ argv)'    C:\Users\dulge\OneDrive\documents\visual studio 2013\Projects\StudentsList\StudentsList\SelectMenu.cpp  8   1   StudentsList
Error   1   error C2039: 'ShowStudentsList' : is not a member of 'StudentsList' c:\users\dulge\onedrive\documents\visual studio 2013\projects\studentslist\studentslist\SelectMenu.h    22  1   StudentsList
Error   2   error C2143: syntax error : missing ';' before '^'  c:\users\dulge\onedrive\documents\visual studio 2013\projects\studentslist\studentslist\SelectMenu.h    22  1   StudentsList
Error   3   error C4430: missing type specifier - int assumed. Note: C++ does not support default-int   c:\users\dulge\onedrive\documents\visual studio 2013\projects\studentslist\studentslist\SelectMenu.h    22  1   StudentsList
Error   4   error C2065: 'ssl' : undeclared identifier  c:\users\dulge\onedrive\documents\visual studio 2013\projects\studentslist\studentslist\SelectMenu.h    109 1   StudentsList
Error   5   error C2061: syntax error : identifier 'ShowStudentsList'   c:\users\dulge\onedrive\documents\visual studio 2013\projects\studentslist\studentslist\SelectMenu.h    109 1   StudentsList
Error   6   error C2065: 'ssl' : undeclared identifier  c:\users\dulge\onedrive\documents\visual studio 2013\projects\studentslist\studentslist\SelectMenu.h    110 1   StudentsList
Error   7   error C2227: left of '->Show' must point to class/struct/union/generic type c:\users\dulge\onedrive\documents\visual studio 2013\projects\studentslist\studentslist\SelectMenu.h    110 1   StudentsList