Thread: win32 - how can i change the windows\form backcolor?

i continue with some problems with windows properties
how can i change the window backcolor?

Code:

//.............
HBRUSH g_hbrBackground = NULL;
//...............
//inst is the class instance pointer
case WM_CTLCOLORSTATIC:
            {
                if ( inst->blnTransparent == true)
                {
                    SetTextColor((HDC)wParam, inst->clrTextColor);
                    SetBkMode( (HDC)wParam, TRANSPARENT);
                    return (LRESULT) GetStockObject(NULL_BRUSH);
                }
                else
                {
                    DeleteObject(g_hbrBackground);
                    SetTextColor((HDC)wParam, inst->clrTextColor);
                    SetBkColor((HDC)wParam,inst->clrBackColor);
                    SetBkMode((HDC)wParam, TRANSPARENT);
                    g_hbrBackground = CreateSolidBrush(inst->clrBackColor);
                    return (LONG)g_hbrBackground;
                }
            }
            break;

finally i put it to work

Code:

SetClassLongPtr(hwnd,GCLP_HBRBACKGROUND, (LONG)CreateSolidBrush(clrBackColor));
                    InvalidateRect(hwnd,NULL,true);

the 'clrBackColor' can be changed with RGB() function.
i must use the InvalidateRect() for change the value... from MSDN:
"Use the SetClassLongPtr function with care. For example, it is possible to change the background color for a class by using SetClassLongPtr, but this change does not immediately repaint all windows belonging to the class."
heres the MSDN page: SetClassLongPtr function (Windows)
from here we can change the icon and mouse icon and more
i have tested with 2 forms but the backcolors are the same