SC_RESTORE is not working properly

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VC6

C++

In my MFC CFormView based application, i want to handle

ON_WM_NCLBUTTONDBLCLK()

windows message. ie, when a user double click on
Tittle bar of the dialog, window needs to be maximise. So i handled the above window message. To check whether clickked area is tittle bar or not iam used

HTCAPTION

. To maximise the dialog there is style called

SC_MAXIMIZE

. i know this. but iam not need this. so that iam used CWnd::MoveWindow function for resize the window.
But again double click is happend, then window needs to be restored.
For that iam handled

OnSysCommand( UINT nID_i, LPARAM lParam )

. ie iam send

::PostMessage( m_hWnd, WM_SYSCOMMAND, SC_RESTORE, 0 )

from double OnNcLButtonDblClk function. but Restore is not working.

handling of Restore.

void CTitleDoubleClickDlg::OnSysCommand(UINT nID, LPARAM lParam)
{
    if( SC_RESTORE == nID )
    {
        CDialog::OnSysCommand(nID, lParam);
    }
    else
    {
        CDialog::OnSysCommand(nID, lParam);
    }
}

My question is
1. How to restore a window to its previous size by using SC_RESTORE( Note: iam using MoveWindow insted of SC_MAXIMISE for maximise the window)