tv_ReqAngle init min max title
Opens a window with a degres numeric input field and two buttons, OK and Cancel. The init argument is the value that appears in the numeric field when the window is opened. The min and max arguments indicate the maximum and minimum allowable values of the contents of the field, respectively. The title argument is the title of the window. This command returns the value contained in the field if the user clicks on OK, or "Cancel" if he clicks on Cancel.