Removing wrapping html elements like div or others of tinyMCE editor

we usually initiate tinyMCE like this:

tinyMCE.init({
});

we also have toolbar list like this:

tinyMCE.init({
 toolbar2: 'forecolor backcolor emoticons fontselect fontsizeselect | ltr rtl | visualchars visualblocks loremipsum loremipsumar| searchreplace | fullscreen code   preview help',
});

we need to first add the button of removeformat, in which generally removes some formatting html tags, so it become like this:

tinyMCE.init({
 toolbar2: 'forecolor backcolor emoticons fontselect fontsizeselect | ltr rtl | visualchars visualblocks loremipsum loremipsumar| searchreplace | fullscreen code   preview help removeformat',
});

now to specific which elements the removeformat will remove upon clicking, we add removeformat_selector config parameter as follows:

tinyMCE.init({
 toolbar2: 'forecolor backcolor emoticons fontselect fontsizeselect | ltr rtl | visualchars visualblocks loremipsum loremipsumar| searchreplace | fullscreen code   preview help removeformat',

removeformat_selector : 'b,strong,em,i,span,ins,div',
});