src/main/java/org/efaps/ui/wicket/behaviors/dojo/DnDBehavior.java
@Override
    public void onComponentTag(final Component _component,
                               final ComponentTag _tag)
    {
        super.onComponentTag(_component, _tag);

        if (this.type == DnDBehavior.BehaviorType.ITEM) {
            String value = "dojoDndItem ";
            if (_tag.getAttribute("class") != null) {
                value += _tag.getAttribute("class");
            }
            _tag.put("dndType", this.dndType);
            _tag.put("class", value);
        }
    }
@Override
    public void onComponentTag(final Component _component,
                               final ComponentTag _tag)
    {
        super.onComponentTag(_component, _tag);

        if (this.type == DnDBehavior.BehaviorType.ITEM) {
            String value = "dojoDndItem ";
            if (_tag.getAttribute("class") != null) {
                value += _tag.getAttribute("class");
            }
            _tag.put("dndType", this.dndType);
            _tag.put("class", value);
        }
    }
The tag of the component must be altered, so that the dojo dnd will be rendered.

@see org.apache.wicket.behavior.AbstractBehavior#onComponentTag(org.apache.wicket.Component,
org.apache.wicket.markup.ComponentTag)
@param _component Component
@param _tag tag to edit