PROBLEM STATEMENT:

click or navigate action doesn't raise 'focused' state for table cell

REPRO:

1. run uia2atk/test/samples/propertygrid.py
2. run accerciser, expand 'tree table' under 'Property Grid' panel on the left treeview, browse to one table cell (e.g 'AccessibleDescript')
3. on GUI, mouse click or press Up/Down to 'AccessibleDescript' table cell
4. on accerciser, see 'AccessibleDescript' table cell states under interface viewer

RESULT:

table cell doesn't raise 'focused' state

EXPECTED RESULTS:

'AccessibleDescript' table cell should raise 'focused' state

COMMENTS:

table cells also should have 'focusable' state because it can be focused by key(see bug516376)