Have a look at the <ahref="#methods">Methods</a> section. In the past, there has been some confusion about how the method handles option groups. If the documentation does not help you, have a look at the issue tracker, as for example issue <atarget="_blank"href="https://github.com/davidstutz/bootstrap-multiselect/issues/356">356</a>.
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<b>A <code>type="reset"</code> button does not refresh the multiselect, what to do?</b>
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Have a look at the <ahref="#further-examples">Further Examples</a> section (in addition, issue <atarget="_blank"href="https://github.com/davidstutz/bootstrap-multiselect/issues/360">360</a> discussed this).