Tabbing contained to only Dhtmlx Screen

When using tab on the Dhtmlx screens, once we reach the end of the Dhtmlx screen the tab sequence continues to the parent screen.How can we make the Tabbing only in the Dhtmlx screen, i.e., the cursor should not reach the parent screen once we reach the end of the Dhtmlx screen.

Please Help.

the component doesn’t provide such a functionality. You need to use own approach to control tabbing

Please suggest some alternative to restrict the Tabbing to only dhtmlx screen . If we Tab on a normal child window, Tabbing will not move back to parent window after finishing the cycle.

Please Help