Disable the owner of a modal dialog box just before creating the

dlls/comctl32/propsheet.c

@@ -360,7 +360,7 @@ static INT PROPSHEET_DoDialogBox( HWND hwnd, HWND owner)
    if (!(wndPtr = WIN_FindWndPtr( hwnd ))) return -1;
    dlgInfo = (DIALOGINFO *)wndPtr->wExtra;
 
-   if (!dlgInfo->flags & DF_END) /* was EndDialog called in WM_INITDIALOG ? */
+   if (!(dlgInfo->flags & DF_END)) /* was EndDialog called in WM_INITDIALOG ? */
    {
        EnableWindow( owner, FALSE );
        ShowWindow( hwnd, SW_SHOW );

include/dialog.h

@@ -37,6 +37,7 @@ typedef struct
 #include "poppack.h"
 
 #define DF_END  0x0001
+#define DF_OWNERENABLED 0x0002
 
 extern BOOL DIALOG_Init(void);