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I add this layer like this:

var POIData = new esri.layers.ArcGISDynamicMapServiceLayer("https://mysite.com/ArcGIS/rest/services/POI_Data/MapServer");
map.addLayer(POIData);
POIData.hide();

I want to show it from a button:

This is the button:

<div id="POIData" data-dojo-type="dojox.mobile.ToolBarButton" style="float: left;"onClick="showPOI();" >POI</div>

And this is the function behind it:

function showPOI(){
    POIData.show();
}

What am I doing wrong?

Any ideas? I just now can't see it, and can't set it to visible.

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