Fit default icons into header button in jQuery Mobile

I'm trying to add a menu-style drop down button to the header of a mobile app created via jQuery Mobile, but I cannot find a way to fit the default 'gear' icon to the button. The following is the HTML page.

<div data-role="header">    
            <a href="#cfgMenu" data-rel="popup" data-role="button" data-inline="true" data-transition="slidedown" data-icon="gear" data-theme="a"></a>

            <div data-role="popup" id="cfgMenu" data-theme="a">
                <ul data-role="listview" data-inset="true" style="min-width: 210px;" data-theme="a">
                    <li data-role="divider" data-theme="a">Configura</li>
                    <li><a href="#">Lingua</a>
                    <li><a href="#">Sci club</a>
                    <li><a href="#">Preferenze</a>


With this HTML the result is the following:

If I add style="height:100%" to the <a> the result is the following:

What can I do to fit the icon into the image?

Just found that adding text everything is OK. But space in the header is limited, so I'd like to avoid this solution


For jQM 1.4 you use button classes instead of the data attributes:

<a href="#cfgMenu" data-rel="popup" class="ui-btn ui-btn-inline ui-icon-gear ui-btn-icon-notext" data-transition="slidedown"  data-theme="a"></a>


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