I have found a solution for this after all, not quite elegant, but works like
charm :)
new ListMultipleChoice("select",new Model(new ArrayList<T>(0)), new
PropertyModel(this, "choices"), renderer) {
@Override
protected void onComponentTag(ComponentTag tag) {
super.onComponentTag(tag);
tag.getAttributes().remove("multiple");
}
};
The trick is to use the multiselect component (because this one neither
requires preselection nor nullValid option.
Having an empty list in the model means nothing is preselected.
Since I do not want it to be multi-selectable, I removed the attribute by
overwriting onComponentTag.
Thats it :)
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