ajaxSingle facet static

# The ajaxSingle/region components in facets of <h:dataTable>

## Description

The RichFaces components that have "ajaxSingle" set to "true" does not work in "header" or "footer" facets of <h:dataTable>, e.g. <rich:datascroller> - scrolling doesn't work.

## Links

- Jira

## How to reproduce

The described above problem occurs if the following code is used. As a result the <rich:datascroller> component stops working.

    ...
    <h:dataTable>
        <f:facet name="header">
            <rich:datascroller ajaxSingle="true"/>
        </f:facet>
        ...
    </h:dataTable>
    ...

## Causes

The ajaxSingle/region requires `invokeOnComponent()` to work properly. For more details, please, see JavaServer Faces issues reporting page.

## Workarounds

The solution is to use <rich:dataTable> component.