how to remove an element from a HashMap object

Hi FreeMarkers,

I have a pojo class as rootMap with DefaultObjectWrapper. The pojo
class expose a HashMap object by getFooMap() which key/value are
string pairs.

The map object could be accessed without problem such as
${fooMap["bar"]}. But couldn't remove the element bar by
${fooMap.remove("bar")}, it show error "Expression fooMap.remove is
undefined".

I am wondering is there any build-in function could help me remove the
element from the map?

Thanks in advance!

-Guo

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