In the date time picker when I want to tab to the next field  I have to tab 3 time because it stops at mm dd yyyy and then goes to the next fields. This is nice but should be made optional. 

The tab behavior is defined by the HTML5 date/time picker HTML element used for this
As far as I could see so far, there is not a way to override this tab behavior
Used OnKeypress event 

  if Key = VK_TAB then

to resolve the problem.

Is there a function to find the next element in the tab order on the form ?

Like in VCL, there is form.SelectNext();