No label shown if selectBox list have been hidden at startup

[antpol]

How to reproduce:

div style=display:none id="hidden"
select class="selectbox".../select
/div

1. Apply onClick event for any element: $("#hidden").show();
2. Click on the element.
3. selectBox will appear now but its label width will be 0px. So only first letter will be shown.

Only solution I've found is to hide objects by javascript after declaring the selectBox.