I have the following drop-down list
<select id="abc" style="width:110px;" class="easyui-combobox" >
<option value=""></option>
<option value="a">A</option>
<option value="b">B</option>
<option value="c">C</option>
</select>
When 1st (empty) option is selected in openned drop-down list it looks like very small yellow line.
The height of this line is less than for usual item.
How can I get "empty" option look like I have any value in it?