Fixed the chrome windows datagrid bug

## Testing:

Make sure that all items (especially the last one) in the datagrids are still able to be selected. Test this with multiple amounts of items in a datagrid.

issue: A24Group/Triage#2536

@kkroese - I've tested this on my local machine at home but you must also test this at your home environment after it has been merged to confirm that all is working now. 

![staffshift](https://f.cloud.github.com/assets/1477827/484854/a9230738-b8e3-11e2-9916-792b059d1753.png)