actionscript 3 - Flex DataGrid in GridItemRenderer -

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i've got hierarchical data show in flex spark datagrid, looking this: 

|------|---------------------------| | row1 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | |  in  | 1 | 2 | 3 | 4 | 5 | 6 | 7 | | outer|---------------------------| | grid | component spans    | |      | on multiple columns here| |----------------------------------| | row2 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | |  in  | 1 | 2 | 3 | 4 | 5 | 6 | 7 | | outer|---------------------------| | grid | component spans    | |      | on multiple columns here| |----------------------------------|

what i'm trying use custom griditemrenderer holds inner datagrid. basic concept looks this: 

<s:datagrid dataprovider="{outerdataprovider}" width="100%" height="100%" variablerowheight="true">     <s:columns>         <s:arraylist>             <s:gridcolumn datafield="name">                 <s:itemrenderer>                     <fx:component>                         <s:defaultgriditemrenderer />                     </fx:component>                 </s:itemrenderer>             </s:gridcolumn>             <s:gridcolumn>                 <s:itemrenderer>                     <fx:component>                         <s:griditemrenderer>                             <s:states>                                 <s:state name="normal" />                                 <s:state name="toggled" />                             </s:states>                             <s:layout>                                 <s:verticallayout />                             </s:layout>                             <s:hgroup>                                 <s:datagrid dataprovider="{data.innerdataprovider}"  columns="{outerdocument.mydynamicgeneratedcolumns}">                                 </s:datagrid>                                 <s:group>                                     <s:togglebutton label="toggle" />                                 </s:group>                             </s:hgroup>                              <mycomponent width="100%" height="50" includein="toggled" />                         </s:griditemrenderer>                     </fx:component>                 </s:itemrenderer>             </s:gridcolumn>         </s:arraylist>     </s:columns> </s:datagrid>

i'm experiencing serious performance issues when adding inner datagrid. vertical scrolling horribly slow.

i've been trying understand optimize, i'm not sure begin. inner datagrid need have dynamic number of columns, , guess 1 of parts needs done.

is wrong this? use component datagrid inner grid structure , better performance?

the grid basicly grid containing images depending on values inside each row.

any suggestions or links datagrid tips?

how using list tilelayout inner grid. perform better:

    <s:list>         <s:layout>             <s:tilelayout/>         </s:layout>     </s:list>

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