The following code fragment shows how to make a pop-up menu appear when the user double-clicks mouse button 2 anywhere in the parent window. The menu is positioned with the mouse pointer located on the item having the IDM_OPEN identifier and is constrained horizontally and vertically. Then, the user can select an item from the pop-up menu using mouse button 2.

    #define ID_MENU_RESOURCE  110
    #define IDM_OPEN          120

    HWND hwndFrame;

    MRESULT ClientWndProc(
    HWND hwnd,
    ULONG msg,
    MPARAM mp1,
    MPARAM mp2)
    {
        HWND hwndMenu;
        BOOL fSuccess;

        switch (msg) {
            .
            .   /* Process other messages. */
            .
            case WM_BUTTON2DBLCLK:
                hwndMenu = WinLoadMenu(hwnd, (HMODULE) NULL, ID_MENU_RESOURCE);
                fSuccess = WinPopupMenu(hwnd,
                                        hwndFrame,
                                        hwndMenu,
                                        20,
                                        50,
                                        IDM_OPEN,
                                        PU_POSITIONONITEM   |
                                        PU_HCONSTRAIN       |
                                        PU_VCONSTRAIN       |
                                        PU_MOUSEBUTTON2DOWN |
                                        PU_MOUSEBUTTON2);

                       .
                       .
                       .