508 compliance in DhtmlxGrid

We have web application that uses old version of dhtmlxGrid and TreeGrid.
Currently we are in process of upgrading the dhtmlxGrid library to newer version. But before that we have to submit analysis to our client - whether dhtmlxGrid is 508 compliance or not?
For 508 compliance required checkpoints are -

  1. Data within data grid should be accessible from keyboard navigation keys like - short keys and tabs
  2. All Grid header operations should be accessible from keyboard navigation keys.
  3. Tooltip in data columns.
  4. Selected column or cell should have visible foucs.

So, my question is that - Does dhtmlxGrid has above support or not? and up to what level.
In case it does not support few of above then can we have handle/control these operations?