I tried the sample page and got the same result. Basically, when you change the bold/italic/underline for the text typed using ctrl+b, ctrl+i, ctrl+u, then the B, I, U buttons in the menu is changing properly. After typing bbbbaalslalssaldlasdassakdasldkaslkdsadjkasdsakdsaldksalk, if you move into specific region style then then the menu buttons changes the high light status. But when you are typing the text, then thing changes of the buttons is not happening properly.

 

Please let me know in case you need more information.

 

Thanks and Regards,

Madhanmohan S