[Cell Renderer] Tabbing from a cell in a DataGrid expecting to go to next cell but goes to next component in tab order instead

Steps to reproduce:
1. import the attached DataGridTest.fxp
2. compile and run DataGridTest
3. Click into the cell in column 1 that says 'Pavement'
4. press your tab key to go to next cell but the DataGrid looses focus and goes to the 'Back' button

When you double click to select the word 'Pavement' you can then cycle through all the cells using the tab key.

Actual Results:
tabs out of DataGrid

Expected Results:
tab to next cell

Workaround (if any):