R1 = Pointer to menu structure
R2 = Number of option to tick/untick (0...nn)
R3 = 0 to untick, any other to tick
If bit 6 of R2 was set in WimpExt_Initialise:
R3 = 0 to untick entry, 1 to tick entry, 2 to toggle tick flag
Exit:
R0 = Old state of menu entry (0 for unticked, 1 for ticked)
Ticks or unticks the specified menu entry. If bit 6 of R2 was
set in WimpExt_Initialise then the alternative parameters are
used as shown.
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