how to select a cell programatically

I want to select a specific cell in TAdvStringGrid programmatically and have it respond with highlighting using the color set in Selection Color.  This is what happens when I click in the cell.  But, I need to have that happen by code selection.  I can't seem to figure out how to do it, and I'm sure that I've done it before. 




That's not quite what's happening.  I have the grid set to "look = glOffice2007" and the object inspector show the SelectionColor to be $005EC1F1, which is what the grid looks like if I click it with a mouse.  Otherwise, the grid color is a light bluish grey, which I don't actually see anywhere in the object inspector default color boxes.  

Some grids, however do show on startup the initial grid cell 0,0 to be this gold color.  I don't see where this light grey color comes from.  Your suggestion does cause the cell I specify to be this grey color.  If I subsequently click on the cell, it does change from the light grey to gold.

procedure TForm3.Button1Click(Sender: TObject);