HeadersToolbar incompatible to other components than Label?

[Benedikt Schlegel]

I've implemented a CheckGroupColumn which is supposed to easily extend
the DataTable with multi-row actions.
But when i add it to my DataTable i get the following exception:
---
WicketMessage: Component label must be applied to a tag of type
'input', not '<span wicket:id="label">' (line 0, column 0)
[markup = 
jar:file:/D:/work/base/LIB_POOL/wicket/wicket-extensions-1.4.9.jar!/org/apache/wicket/extensions/markup/html/repeater/data/table/HeadersToolbar.html
<wicket:panel>
        <tr class="headers">
                <span wicket:id="headers">
                        <th wicket:id="header"><span 
wicket:id="label">[header-label]</span></th>
                </span>
        </tr>
</wicket:panel>, index = 6, current = '<span wicket:id="label">' (line
21, column 27)]
---

I do understand whats wrong here, but i have no clue how to work a
round that problem. Any ideas?

Heres the CheckGroupColumn.java:
public class CheckGroupColumn<T> extends AbstractColumn<T> {
        private static final long serialVersionUID = 1L;
        
        private CheckGroup<T> checkGroup;

        public CheckGroupColumn(CheckGroup<T> checkGroup) {
                super(new Model<String>(""));
                this.checkGroup = checkGroup;
        }
        
        @Override
        public Component getHeader(String componentId) {
                return new CheckGroupSelector(componentId, checkGroup);
        }

        @Override
        public void populateItem(Item<ICellPopulator<T>> cellItem, String
componentId, IModel<T> rowModel) {
                cellItem.add(new Check<T>(componentId, rowModel, checkGroup));
        }
}

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