Flicker in window resize, controls

I have several controls that need to be scaled when a window is to be resized. I am doing so using Begin/End/DeferWindowPos.

Code:

int ScaleWindowControls(HWND hwnd, int x, int y)
{
    HWND chatwnd = ::GetDlgItem(hwnd, IDC_CHATTY);
    HWND mainwnd = ::GetDlgItem(hwnd, IDC_MAIN);
    HWND entrbtn = ::GetDlgItem(hwnd, IDC_BUTTON);
    
    if(!chatwnd || !mainwnd || !entrbtn)
        return 0;
    
    HDWP collection = ::BeginDeferWindowPos(3);
    
    collection = ::DeferWindowPos(collection, entrbtn, 0, x - 37, 
                                  y - 20, 36, 19, SWP_NOZORDER);
    
    collection = ::DeferWindowPos(collection, mainwnd, 0, 1, 0, x - 
                                  2, y - 22, SWP_NOZORDER);
    
    collection = ::DeferWindowPos(collection, chatwnd, 0, 1, y - 
                                  20, x - 40, y, SWP_NOZORDER);
        
    if(!::EndDeferWindowPos(collection))
    		return 0;
            
    return 1;
}

It has a considerable amount of flickering. I am wondering whether taking control over the messages sent, optimizations, or subclassing would help this problem.

The flickering could be caused by overlapping controls, or the parent window drawing the background first, then the controls drawing over the background. Try giving the parent window the WS_CLIPCHILDREN style, and giving the controls WS_CLIPSIBLINGS.

if that doesn't work, try returning true from WM_ERASEBKGND messages...

http://www.catch22.net/tuts/
this might help

Word.