Display item renderer in only some rows of a datagrid

Question

I need to display a combobox item renderer in my datagrid
only in the first of every 5 rows. With the remaining 4 rows in
this particular column empty. Then the pattern will repeat again.
This is how I am currently creating the columns however with
this approach the combobox itemrenderer is appearing in all rows
<mx:columns>
<mx:DataGridColumn headerText="No."
dataField="assCriteriaNum" width="60" />
<mx:DataGridColumn headerText="Assessment Criteria"
dataField="assCriteria" width="210"/>
<mx:DataGridColumn headerText="Mark Range"
dataField="markRange" width="50" />
<mx:DataGridColumn headerText="Mark" dataField="mark"
width="70" >
<mx:itemRenderer>
<mx:Component>
<mx:ComboBox>
<mx:dataProvider>
<mx:ArrayCollection>
<mx:String>0</mx:String>
<mx:String>1</mx:String>
<mx:String>2</mx:String>
<mx:String>3</mx:String>
<mx:String>4</mx:String>
<mx:String>5</mx:String>
<mx:String>6</mx:String>
<mx:String>7</mx:String>
<mx:String>8</mx:String>
<mx:String>9</mx:String>
<mx:String>10</mx:String>
</mx:ArrayCollection>
</mx:dataProvider>
</mx:ComboBox>
</mx:Component>
</mx:itemRenderer>
</mx:DataGridColumn>
</mx:columns>

Answer 1

Here is my data provider hard coded
<mx:dataProvider>
<mx:ArrayCollection>
<mx:Array>
<mx:Object assCriteria="A01 Manage." />
<mx:Object assCriteriaNum="1" assCriteria="Brief project
plan, with little evidence of monitoring progress of project work
against the project plan." markRange="(1-3)" />
<mx:Object assCriteriaNum="2" assCriteria="Limited
identification of the topic to be investigated/ researched and
limited evidence of appropriate aims and objectives, and proposed
project title." markRange="(1-3)" />
<mx:Object assCriteriaNum="3" assCriteria="Project plan,
with some evidence of monitoring progress of project work against
the project plan." markRange="(4-6)" />
<mx:Object assCriteriaNum="4" assCriteria="Some
identification of the topic to be investigated/ researched and some
evidence of appropriate aims complete the work and objectives, and
proposed project title." markRange="(4-6)" />
<mx:Object assCriteriaNum="5" assCriteria="Detailed
project plan, with clear evidence of monitoring progress of project
work against the project plan." markRange="(7-10)" />
<mx:Object assCriteriaNum="6" assCriteria="Clear
identification of the topic to be investigated/ researched and
clear evidence of appropriate aims identify the topic and
objectives, and proposed project title." markRange="(7-10)" />
<mx:Object assCriteriaNum="7" assCriteria="No relevant
response." markRange="(0)" />
<mx:Object assCriteria="A02 Use resources/research."
/>
<mx:Object assCriteriaNum="8" assCriteria="Little or no
analysis and application of the research, with few links made to
appropriate theories and concepts." markRange="(1-5)" />
<mx:Object assCriteriaNum="9" assCriteria="Evidence of
limited research involving limited selection and evaluation of
sources." markRange="(1-5)" />
<mx:Object assCriteriaNum="10" assCriteria="Some analysis
and application of the research, with links made to appropriate
theories and concepts." markRange="(4-6)" />
<mx:Object assCriteriaNum="11" assCriteria="Evidence of
some research involving the selection analyse data and evaluation
of a range of relevant sources." markRange="(4-6)" />
<mx:Object assCriteriaNum="12" assCriteria="Critical
analysis and application of the research, with obtain and select
clear links made to appropriate theories and information from a
concepts. variety of sources." markRange="(7-10)" />
<mx:Object assCriteriaNum="13" assCriteria="Evidence of
detailed research involving the selection and evaluation of a wide
range of relevant sources." markRange="(7-10)" />
<mx:Object assCriteriaNum="14" assCriteria="No relevant
response." markRange="(0)" />
</mx:Array>
</mx:ArrayCollection>
</mx:dataProvider>