HTML/JS - Button.disabled is off function

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Javascript

In my page created, there is a HTML button control, which is initially set as

<div style="height:30px"> 
    <button id="qButton" dojotype="dijit.form.Button" disabled="disabled" onclick="queryButton_onclick();">Query</button>
</div>

In the JS code, I turned it enabled

document.getElementById("qButton").removeAttribute("disabled");

In debugging, I can see that qButton.disabled = false. However, the button is still greyed. Thanks in advance for your response.