Controls in a GroupBox

Hi everybody,

I've created a groupbox containing some buttons but I have a problem:
I can't receive the notifications from the controls inside the groupbox

I have searched on Google and I have found that I can change the controls WindowPocedure using SetWindowLong(hGrpControls,GWL_WNDPROC,(LONG)GrpControlsProc);

This makes me receive the notifications but makes the control disappear

This is my code:

Code:

[SIZE=2]hGrpControls = CreateWindow(L[/SIZE][SIZE=2][COLOR=#a31515][SIZE=2][COLOR=#a31515]"BUTTON"[/COLOR][/SIZE][/COLOR][/SIZE][SIZE=2], TEXT([/SIZE][SIZE=2][COLOR=#a31515][SIZE=2][COLOR=#a31515]"Module controls"[/COLOR][/SIZE][/COLOR][/SIZE][SIZE=2]), (WS_VISIBLE | WS_CHILD | BS_GROUPBOX | WS_TABSTOP), 26, 50, 270, 107, hClip, NULL, MyAppInst, NULL);[/SIZE]
[SIZE=2]SendMessage(hGrpControls, WM_SETFONT, (WPARAM)CrlFont, 0);[/SIZE]
S[SIZE=2]etWindowLong(hGrpControls,GWL_WNDPROC,(LONG)GrpControlsProc);[/SIZE]

can anyone help me please?

 

It dissappears because you need to handle the paint and other messages properly.