About button state color

    btn_test_start = lv_btn_create(tab2,NULL);
    lv_btn_set_checkable(btn_test_start,true);
    lv_obj_set_pos(btn_test_start,630,120);

lv_obj_set_style_local_bg_color(btn_test_start,LV_BTN_PART_MAIN,LV_BTN_STATE_CHECKED_RELEASED,LV_COLOR_BLUE);

The button works fine when I click within the range of the button, but when I click another widgets take the button out of focus, the button changes to a different color. When I went to get its status, it was still LV_BTN_STATE_CHECKED_RELEASED. But the color is not what I want.