%dd can be used with %rd - Edit Integer in order to provide an attached spin wheel.
step is the size of the increase/decrease. The resulting %rd - Edit Integer value will
be a multiple of step. Any call-back function should be attached to %rd - Edit Integer.
%dd is placed before the %rd - Edit Integer to which it refers.
%dd can also be used with %rs - Edit String. In this case it should have a non-zero step
value (which is ignored). The subsequent %rs - Edit String box should have a call-back
function which uses clearwin_string@('CALLBACK_REASON') to identify the reasons
'SPIN_UP' and 'SPIN_DOWN'. The call-back function must provide the response to
the spin (for example, by cycling through the days of the week).