I also tried the code below from your example. The problem comes if the C1Flexgrid is loaded and the Column I want to click is not currently visible. In your example you are passing column #5, but lets say that you want column 20 which would require you to scroll. Either the cold below before the click to bring the cell to view or the code - wGrid.Select_7(rowId, colId, true); will do the trick, BUT as soon as the click event is called I get the error message.
//Code copied from (http://smartbear.com/support/viewarticle/8973/?FullScreen=1)
Thanks for the reply.