Hallo! Can anybody tell me how to get an Javascript-Object of a ScrollableDataTable-Component. If I try following

alert(#{rich:component('viewgrid')})

---------

<rich:scrollableDataTable id="viewgrid"
 rowKeyVar="rkv" frozenColCount="1"
 height="200px" width="99%" rows="30" var="row"
 value="#{backingBean.model}"
 selection="#{backingBean.selection}"
 binding="#{backingBean.tableComponent}"
 sortMode="single">

</rich:scrollableDataTable>

... alert shows 'undifined'

There is an Info in Developer Guide about a JS-function "collapse(columnId)". But how do I get an Object to call this function?