The columnGroup doesn`t support resizing itself. In order to resize the column the column headers needs to be defined by the "ice:column" not by the "columnGroup".
However if the headers are defined by the both "column" and "columnGroup" then changing the column header will resize the columnGroup too.
(e.g.)
The following columns won't be resized, as all the headers are defined by the columnGroup
<ice:dataTable resizable="true">
<f:facet name="header">
<ice:columnGroup>
<ice:headerRow>
<ice:column colspan="2">
<ice:outputText value="Full Name"/>
</ice:column>
</ice:headerRow>
<ice:headerRow>
<ice:column>
<ice:outputText value="First Name"/>
</ice:column>
<ice:column>
<ice:outputText value="Last Name"/>
</ice:column>
</ice:headerRow>
</ice:columnGroup>
</f:facet>
.....
</ice:dataTable>
The first name and last name can be resized, as they are defined as a column header.
<ice:dataTable resizable="true">
<f:facet name="header">
<ice:columnGroup>
<ice:headerRow>
<ice:column colspan="2">
<ice:outputText value="Full Name"/>
</ice:column>
</ice:headerRow>
</ice:columnGroup>
</f:facet>
<ice:column>
<f:facet name="header">
<ice:outputText value="First Name"/>
</f:facet>
<ice:outputText value="......"/>
</ice:column>
<ice:column>
<f:facet name="header">
<ice:outputText value="Last Name"/>
</f:facet>
<ice:outputText value="......"/>
</ice:column>
</ice:dataTable>
revision 16006