QTpro

[bitit]

ok solved .
with this plugin is sufficient set in :
Product Info Attribute Display Plugin
X sequenced_dropdowns

but if is possible have another way for it, please inform me

[raiwa]

I'm not sure if I understand your question. But maybe it's this:
Set: Show default 'Please Select' option to false
Then the first value will be selected by default.
Then you can control the first, default value by attributes values sort order.