I want to control circular_gauge in GUIX.

UINT window2_handler(GX_WINDOW *widget, GX_EVENT *event_ptr)
{
  //GX_WINDOW p_splash_screen;
    UINT result = gx_window_event_process(widget, event_ptr);
   
//gx_studio_named_widget_create("TWindow",GX_NULL ,GX_NULL);
    GX_PROMPT * adc_Prompt = NULL;
    GX_CIRCULAR_GAUGE * gauge;
    switch (event_ptr->gx_event_type)
    {
        case GX_FIRST_APP_EVENT:         
          angle++;
        gx_widget_find(widget, gauge_ID, GX_SEARCH_DEPTH_INFINITE, &gauge);
        gx_circular_gauge_angle_set(gauge, angle);

            break;

}}

Above is my source, guix settings and images.
When you run the program, the image of Needle Pixelmap disappears.
If you clear gx_circular_gauge_angle_set (), it will not disappear.
What went wrong?

There is no coding related to gauge other than the above program source.