Dom,
I got my issue resolved.

Unfortunately my list box only has two columns of the datagrid, so not an exact 
object match. However, my datagrid is an ArrayCollection. So I took the unique 
value from my listbox and just did a while loop through the ArrayCollection and 
casting each item to an Object using:
myObject = myArrayCollection.getItemAt(index).

Then I just compared the value from my list box to the unique value in my 
ArrayCollection:
if (myObject.myDataValue == myListBoxDataValue)
{
    // scroll to the row
    datagrid.scrollToIndex(index);
    // now highlight the row
    datagrid.selectedIndex = index; 
}

I didn't need to trigger a mouse click on that row like I thought. In my 
datagrid I had a handler for the itemClick event, so I just called that method.

Thanks for the guidance.
Greg

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