TreeGrid header row columns with same names

Hi,

I would like to build a treegrid with multiple header rows, and I need to use some header row columns with the same name in a row. I try to use a HierarchicalContainer and the following code:

...
for (...) {
    addContainerProperty(column, String.class, "");
}
...

, but in the IndexedContainer has:

public boolean addContainerProperty(Object propertyId, Class<?> type, Object defaultValue) {
...
        // Fails if the Property is already present
        if (propertyIds.contains(propertyId)) {
             return false;
        }
...
}

Any idea, how can I do that?

Thanks

Hi,

Use unique property values, just add different texts to the header cells.

-Olli