not sure whats going on from the code you provide but i dont think StreamDataGridPanelInnerClass is part of the flex SDK (its certainly not listed in the lang ref). are you using 3rd party components somewhere?
StreamDataGridPanel.mxml Is the name of the Component holding the DataGrid
the error says you are trying to use StreamDataGridPanelInnerClass as an itemrenderer, but it doesnt implement IListItemRenderer so an error is thrown.
do you still get the same error if you remove this?
No..I guess I should just take another route and not try to make in an inline item renderer.