Change the animation type when open & close the drop-down panel.
<div style="margin:20px 0">
<span>Animation Type:</span>
<select onchange="changeAnimation(this.value)">
<option>slide</option>
<option>fade</option>
<option>show</option>
</select>
</div>
<div class="easyui-panel" style="width:100%;max-width:400px;padding:30px 60px;">
<div style="margin-bottom:20px">
<input id="cc" label="Animation:" labelposition="top" style="width:100%;">
</div>
</div>
<script type="text/javascript">
$(function(){
$('#cc').combo();
changeAnimation('slide');
});
function changeAnimation(atype){
$('#cc').combo('panel').panel({
openAnimation:atype,
closeAnimation:(atype=='show'?'hide':atype)
});
}
</script>