This article gives the ability to make MFC dialogs expand or contract. The CExpandContractHelper simplifies the process to  expand or contract MFC Dialog.

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There are 4 Approaches to accomplish this.

Approach 1. (Explicit) P/Invoke
Approach  2. Dynamic P/Invoke
Approach 3. Implicit P/Invoke (Use a C++/CLI wrapper)
Approach 4. Convert C++ DLL to a COM server, and call it from .NET code through .NET-COM interop

I don’t like to reinvent the wheel so please go through msdn forum answer here

The CWinFormsControl class provides the basic functionality for hosting of a Windows Forms control.

For more information on using Windows Forms, see below MSDN articles

1. Using a Windows Form User Control in MFC

2. MFC and WinForms Integration

This step-by-step article describes how to call a managed DLL from native C++ code.

Click me to take to the Microsoft KB article.

In Visual Studio 2010, the size of statically-linked MFC applications grew substantially. Pat Brenner, a developer on the Visual C++ Libraries team in his article explains how to reduce the size.

Read more about this here

Use the CWnd::CenterWindow method to center the dialog. Write CenterWindow() method in the OnInitDialog() method.

BOOL CMyDialog::OnInitDialog()
{
    CenterWindow();

    return TRUE;
}