ComboBoxItem (FireFox 3.0) - When only 1 item in Picklist, the item is not visible

[silco]

This problem occurs in FireFox 3.0. Internet Explorer 8 works fine, while with Google Chrome always all items in the picklist are shown in the 2. Case.

1. Case: When there is only 1 item in a combobox-picklist, the item becomes visible only after pressing the arrow down key followed by arrow up key.

2. Case: The same behavior occurs with an editable ComboBoxItem. When starting to write the required value the number of picklist items decrease until finally there is only the required value left. Again, this value in the picklist isn't visible unilt pressing the arrow keys again.

combobox1.jpg -> picklist shows all items as long as there is more than 1 item
combobox2.jpg -> only one item left
combobox3.jpg -> after pressing down arrow key
combobox4.jpg -> after pressing up arrow key

I tried everything with the following properties, setting them all to different values in different combinations, nothing helped.
cbi.setPickListHeight(800);
cbi.setEmptyPickListHeight(800);
cbi.setAnimatePickList(false);
cbi.setCompleteOnTab(true);
cbi.setDefaultToFirstOption(true);

What could be the problem?

[svjard]

See FAQ about external CSS, other the many other posts on the exact same thing.