Win32 Handling Internal Paint Messages - c++

Question

I am running a Win32 application in debug mode using Visual Studio. After switching to Visual Studio to debug my application does not continue its message loop...no messages are being sent...How do I handle focus/activation messages in order to resume the message loop?
EDIT:
This application uses DirectX9. I have 2 viewports( device swapchains ) to which I render geometry. If, during runtime, I click on a different window and then later try to return to my application both viewports are black( not being rendered to ). I set breakpoints in the message loop and am finding that one message( WM_PAINT ) is constantly being translated and dispatched, thus preventing my application from rendering. Below is message loop. 'bGotMsg' is always true after returning focus to my application...
EDIT: The problem seems to be an internal WM_PAINT message that is not being handled...I've checked the message that is continually being dispatched and the window handle is not one of my application...could it be some internal handle? MSDN indicates here that a WM_PAINT message will be sent while no other messages are in the queue or until the internal paint message is handled...How do I handle this message?
HRESULT WINAPI GDEMainLoop( HACCEL hAccel )
{
HRESULT hr =S_OK;
HWND hWnd = DXUTGetHWND();
// Now we're ready to receive and process Windows messages.
bool bGotMsg;
MSG msg;
msg.message = WM_NULL;
PeekMessage( &msg, NULL, 0U, 0U, PM_NOREMOVE );
while( WM_QUIT != msg.message )
{
// Use PeekMessage() so we can use idle time to render the scene.
bGotMsg = ( PeekMessage( &msg, NULL, 0U, 0U, PM_REMOVE ) != 0 );
if( bGotMsg )
{
// Translate and dispatch the message
if( /*!TranslateAccelerator( hWnd, hAccel, &msg )*/
!IsDialogMessage( wnd.GetWindow( CWindowManager::EXPLORERBAR ), &msg )
&& !IsDialogMessage( wnd.GetSceneOutliner()->GetHWND(), &msg )
&& !IsDialogMessage( wnd.GetResourceOutliner()->GetHWND(), &msg )
&& !IsDialogMessage( wnd.GetProjectOutliner()->GetHWND(), &msg )
&& !IsDialogMessage( wnd.GetProjectDialog()->GetHWND(), &msg )
&& !IsDialogMessage( wnd.GetSceneDialog()->GetHWND(), &msg ) )
{
TranslateMessage( &msg );
DispatchMessage( &msg );
}
}
else
{
if( FAILED( hr = GDERender3DEnvironment() ) )
{
DebugStringDX( MainClassName, "Failed to GDERender3DEnvironment() at GDEMainLoop()", __LINE__, hr );
Alert( NULL,
L"A failure occured while trying to render the 3D environment!",
L"Render Failure" );
PostQuitMessage( 0 );
}
}
}
return S_OK;
}