example code:
.....other content ....
<rich:comboBox id="combox" suggestionValues="#{firstTestBean.items}"
directInputSuggestions="true" value="#{item.value}" defaultLabel="Enter some value" >
</rich:comboBox>
........
<rich:suggestionbox id="suggestionBoxId" popupClass="suggestBox" for="suggest" tokens=","
rules="#{suggestionBox.rules}"
suggestionAction="#{firstTestBean.autocomplete}" var="result"
fetchValue="#{result}"
minChars="2"
width="220"
height="#{firstTestBean.divHeight}"
border="1"
nothingLabel="No capitals found" >
<h:column>
<h:outputText value="#{result}" />
</h:column>
</rich:suggestionbox>
.....other content ....
when the outer div scrolled ,float selectitem will far from inputtext
please check latest CR. Should be fixed there.