int find_next_textbox(BC_WindowBase **first_textbox, BC_WindowBase **next_textbox, int &result);
int find_prev_textbox(BC_WindowBase **last_textbox, BC_WindowBase **prev_textbox, int &result);
int find_next_textbox(BC_WindowBase **first_textbox, BC_WindowBase **next_textbox, int &result);
int find_prev_textbox(BC_WindowBase **last_textbox, BC_WindowBase **prev_textbox, int &result);