about jquery mobile,when checkbox item contains textbox,textbox will displays irregularly

about jquery mobile,when checkbox item contains textbox,textbox will displays irregularly

Code are here,I don't why,can some one tell me,how a textbox can be included in a checkbox item?
thanks a lot! 

<fieldset data-role="controlgroup">
        <legend>Vertical:</legend>
        <input type="checkbox" name="checkbox-v-2a" id="checkbox-v-2a">
        <label for="checkbox-v-2a">One</label>
        <input type="checkbox" name="checkbox-v-2b" id="checkbox-v-2b">
        <label for="checkbox-v-2b">Two</label>
        <input type="checkbox" name="checkbox-v-2c" id="checkbox-v-2c">
        <label for="checkbox-v-2c">
           Three
          <input type="text" id="aaa1444" style="padding: 5px; height: 50px;"  />
       </label>
</fieldset>

The following picture is what I expect,how can i do that? Thanks again!