Actions on MultiBox

[#1]

I am trying to create actions for a multibox control.  I need it to perform certain selections based on certain values in the mulitbox. eg If multibox selection = 'Apple', then select 'Green' and 'Red' and 'Yellow' in the Colours Listbox.

Obviously it does not have actions linked to it itself and some other method has to be applied to it.  Does anyone know how I can achieve this ?]

[Chanty4u]

You can use 'field event triggers' (in settings - document properties - triggers), triggered by OnSelect or OnChange events for FieldA.

[#3]

Thanks.  But Im not sure which specific event I should use : OnSelect or OnChange.  And how exactly do I apply it especially when I have a criteria like If mulitibox value = 'Apple' then ....