I am looking for a way to emulate clicking the row selector when a row is selected. If you click the row selector the down key and up key will allow you to navigate rows. If you click in a row it does not really select the row the same as clicking selector and therefore the up and down keys do not navigate the rows. I know this can be handled in the key down event but this seems more like a bug.
When you click inside the row itself, you're actually clicking on a cell, which entails different behavior. Whether or not the up and down arrows should work at this point may depend on other configuration, such as whether you're using row layouts and if you've overridden any of the grid's key action mappings.
If you want clicking on the cell to select the whole row, set your grid's CellClickAction to "RowSelect". Note that this will essentially prevent your grid from being updated by the user.