Kendo Datepicker header (Month - Today buttons) is hidden on toggle.

[RAMAKRISHNAN]

Not sure why, but when i use the kendo-datepicker anywhere in my application, datepicker header template is invisible. I tried with kendo-calender, header is visible initially, but on click of any date buttons or "Today" button it's hiding. Kindly assist soon. Am I missing something? Is there any event's that should be controlled? or can we resolve with styles? 

<kendo-datepicker></kendo-datepicker>