How to change MFC view by clicking a button inside the mainframe?

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MFC

Hello everybody,
I want to change the presented View by clicking a button inside a Window... So not with the menue of MainFrame. I had a lot of problems at first to only change the view, i found a Tutorial here, how to do it without Doc/View Architecture Using views effectively without the doc/view overhead[^] that was very helpful!
I use visual Studio community for my MFC Projects.

What I have tried:

I made an MFC Project (SDI) without Doc/View support.
I made two more Views in the Designer and added Classes to them. The new View Classes are derived from CFormView.
I changed the Constructor and Destructor of the new View Classes to public.

Added them as pointers to MainFrm.h:

CMainView*        m_pMainView;
CSecondView*      m_pSecondView;

I changed the OnCreate(),OnSetFocus() and OnCmdMsg() Method of MainFrm.cpp like this:
(That allows to present the FormView i made with the Designer)

...

int CMainFrame::OnCreate(LPCREATESTRUCT lpCreateStruct)
{
	if (CFrameWnd::OnCreate(lpCreateStruct) == -1)
		return -1;

	// First, build the view context structure
	CCreateContext ccx;

	// Designate the class from which to build the view
	ccx.m_pNewViewClass = RUNTIME_CLASS(CMainView);

	// Using the structure, create a view
	m_pMainView = DYNAMIC_DOWNCAST(CMainView, this->CreateView(&ccx));
	

	if (!m_pMainView)
	{
		TRACE0("creation of view failed");
	}

	// Do layout recalc
	RecalcLayout();

	// Show the view and do an initial update

	m_pMainView->ShowWindow(SW_SHOW);
	m_pMainView->OnInitialUpdate();

	// Set this view active
	SetActiveView(m_pMainView);

	// Order it to resize the parent window to fit
	m_pMainView->ResizeParentToFit(FALSE);


	return 0;
}

...

void CMainFrame::OnSetFocus(CWnd* /*pOldWnd*/)
{

    m_pMainView->SetFocus();
}

BOOL CMainFrame::OnCmdMsg(UINT nID, int nCode, void* pExtra, AFX_CMDHANDLERINFO* pHandlerInfo)
{

    if (m_pMainView->OnCmdMsg(nID, nCode, pExtra, pHandlerInfo))
        return TRUE;

    return CFrameWnd::OnCmdMsg(nID, nCode, pExtra, pHandlerInfo);
}

Now here comes my problem! I have a button on the First presented View and if you click on it, the view should change. I made the following function with the event handler in the Designer:

void CMainView::OnBnClickedButton1()
{
// What to do here? I want to change the current view to another View by clicking the button
}

If i handle it in the MainFrm.cpp class for example with menue buttons it is no problem... that works fine:

void CMainFrame::OnViewNextview()
{
    CCreateContext ccx2;
    ccx2.m_pNewViewClass = RUNTIME_CLASS(CSecondView);
    m_pSecondView = DYNAMIC_DOWNCAST(CSecondView, this->CreateView(&ccx2));

    RecalcLayout();

    m_pMainView->ShowWindow(SW_SHOW);
    m_pMainView->OnInitialUpdate();

    SetActiveView(m_pMainView);

    m_pMainView->ResizeParentToFit(FALSE);

}

I tried to write a function in CMainFrame and call this function in CMainView::OnBnClickedButton1() but i dont know how to get the current MainFrm Object. A pointer on MainFrm or a member of it in CMainView did not work.

I searched and red tutorials for days to solve my problem. I also tried it with Doc/View support like shown here: https://docs.microsoft.com/en-us/cpp/mfc/adding-multiple-views-to-a-single-document?view=vs-2019 but i dont know where to call switchView() correctly.

Maybe anyone can help...