Added event onFocus which occur when filter input element focused.
Added event onFocus which occur when filter input element focused.

AndreyTepaykin/Platform,AndreyTepaykin/Platform,AndreyTepaykin/Platform,AndreyTepaykin/Platform,EGreg/Platform,EGreg/Platform,Qbix/Platform,EGreg/Platform,jkokh/Platform,Qbix/Platform,Qbix/Platform,EGreg/Platform,jkokh/Platform,jkokh/Platform,jkokh/Platform,Qbix/Platform