MFC Custom Control in a MFC DLL

Hello everyone!!

I'm going to make a custom control which can be loaded on Toolbox to
add in a MFC Application as a component. Before I tried creating a MFC
ActiveX Control but it's an OCX and plus it uses COM.
So I'm trying to create a regular DLL (which could have more than one
control...) and I started with creating a new MFC DLL choosing Use MFC
in a Shared DLL.
Then I added a MFC Class where at the start I want to show a rectangle
that redraws every time I resize the control on a resource window in a
MFC application.

I'd like to know how I can initialize the MFC DLL in the main .CPP
file of the DLL in the way I can load the DLL in the Toolbox and have
a custom control to apply in a MFC application? Or maybe I shall
change the CWnd base in my class with, for example, CDialog?

Thanks to everyone in advance for the suggests..... :-)

Ciao
Luigi

Here's the code of custom control's class:

//
// CaChart.cpp : implementation file
//

#include "stdafx.h"
#include "CACharts.h"
#include "CaChart.h"

// CCaChart

IMPLEMENT_DYNAMIC(CCaChart, CWnd)

CCaChart::CCaChart()
: iGraphType(GRAPH_BARS)
{
        RegisterWindowClass();
}

CCaChart::~CCaChart()
{
}

// Register the window class if it has not already been registered.
BOOL CCaChart::RegisterWindowClass()
{
    WNDCLASS wndcls;
    HINSTANCE hInst = AfxGetInstanceHandle();

    if (!(::GetClassInfo(hInst, CACHART_CLASSNAME, &wndcls)))
    {
        // otherwise we need to register a new class
        wndcls.style = CS_DBLCLKS | CS_HREDRAW |
CS_VREDRAW;
        wndcls.lpfnWndProc = ::DefWindowProc;
        wndcls.cbClsExtra = wndcls.cbWndExtra = 0;
        wndcls.hInstance = hInst;
        wndcls.hIcon = NULL;
        wndcls.hCursor = AfxGetApp()->LoadStandardCursor
(IDC_ARROW);
        wndcls.hbrBackground = (HBRUSH) (COLOR_3DFACE + 1);
        wndcls.lpszMenuName = NULL;
        wndcls.lpszClassName = CACHART_CLASSNAME;

        if (!AfxRegisterClass(&wndcls))
        {
            AfxThrowResourceException();
            return FALSE;
        }
    }

    return TRUE;
}

BEGIN_MESSAGE_MAP(CCaChart, CWnd)
        //{{AFX_MSG_MAP(CCaChart)
        ON_WM_PAINT()
        ON_WM_ERASEBKGND()
        //}}AFX_MSG_MAP
END_MESSAGE_MAP()

// CCaChart message handlers
void CCaChart::OnPaint()
{
    CPaintDC dc(this); // device context for painting

    // Create memory DC
    CDC MemDC;
    if (!MemDC.CreateCompatibleDC(&dc))
        return;

    CRect rect;
    GetClientRect(rect);

        MemDC.FillRect(rect, CBrush::FromHandle((HBRUSH)GetStockObject
(BLACK_BRUSH)));
        MemDC.Ellipse(rect);
}

BOOL CCaChart::OnEraseBkgnd(CDC* pDC)
{
        return CWnd::OnEraseBkgnd(pDC);
}

void CCaChart::PreSubclassWindow()
{
        // TODO: Add your specialized code here and/or call the base
class
        // In our case this is not needed - yet - so just drop through
to
    // the base class

        // Get Size of Display area

        CWnd::PreSubclassWindow();
}

BOOL CCaChart::Create(CWnd* pParentWnd, const RECT& rect, UINT nID,
DWORD dwStyle /*=WS_VISIBLE*/)
{
        return CWnd::Create(CACHART_CLASSNAME, _T(""), dwStyle, rect,
pParentWnd, nID);
}

void CCaChart::set_GraphType(GRAPH_TYPE graphtype)
{
        iGraphType = graphtype;
}

GRAPH_TYPE CCaChart::get_GraphType()
{
        return (GRAPH_TYPE)iGraphType;
}