Disable mouseDoubleClick on form (WndProc)

Question

I am using the WndProc function to control my custom shaped form.I can move the form perfectly but i dont know how to disable the doubleclick event on the form.My form has a fixed size,.... in this case the doubleClick causing problems.

here is the WndProc :

static const int WM_NCHITTEST = 0x84;
static const int HTCLIENT = 0x1;
static const int HTCAPTION = 0x2;

    virtual void WndProc(Message% m) override    {
       
        switch(m.Msg)
        {
         
        case WM_NCHITTEST:
                __super::WndProc(m);
                if ((int)m.Result == HTCLIENT)
                    m.Result = (IntPtr)HTCAPTION;
                break;

            default:
                __super::WndProc(m);
                   break;
        }
       
        return;
    }