<!--Dropdown with header -->
<span class="dropdown pmd-dropdown clearfix">
    <button class="btn pmd-ripple-effect btn-primary dropdown-toggle" type="button" id="dropdownMenu2" data-toggle="dropdown" aria-expanded="true">Dropdown with Header <span class="caret"></span></button>
    <ul aria-labelledby="dropdownMenu2" role="menu" class="dropdown-menu">
        <li class="dropdown-header" role="presentation">Dropdown header</li>
        <li role="presentation"><a href="javascript:void(0);" tabindex="-1" role