Reset the state of format Buttons on CkEditor

In the my webpage, there is the resetting CKeditor process. When resetting data in CKeditor, only data is reset and the state of the buttons above is not reset.

Example: Before resetting data, the focused text is bold, so that the BOLD (B) button is selected. After resetting data, all of data is clear but the selecting state of Bold button is not cleared.

How to reset state button when resetting data on CKEditor. Please help me. Thanks a lot.