Shift/END/HOME keys when editing a cell

I used the editable cell template, dbl-click sets it to edit, then when i use shift, end, home. and maybe ither keys, they dont do what i expect.

home - will highlight the top most row,
end - will highlight the bottom most row,
and shift doesn't do anything (wont let me highlight text)

is there any way to make them highligh, so if i goto end a sell hold shift and end will highlight the current postion to the end of the cell, and so one, shift and right arrow should highlight one character at a time,.