JQuery Mobile not applied

I'm having some troubles with JQueryMobile because i want to implement some widgets but the themes and color of the widgets is not well-implemented.

Here's a photo to show what's happening:

And the correct widget for example would be that:

If i add the jquerymobile widgets dynamically then the theme is not well-added but if the html is already on a file (not added dynamically with javascript) the theme looks well. Here's the code I use to add the widgets:

function cesta_insert_html(){
    var cesta_bought = $('body').data('cesta_list');
    cesta_bought.forEach(function(element, index){
        image = get_product_info(element[0].id, 'data' + $('body').data('clicked_listview_item'));
        $('#cesta_view').append('<div data-role="collapsible-set" id="collapsible" data-theme="a" data-content-theme="c"><div data-role="collapsible" data-collapsed="false"><h3 id="title_collapsible">'+image.pname+'</h3><center><div id=image_cesta><img src=data:imajpeg;base64,'+image.pimage+' alt="image"></div><div data-role="fieldcontain"><fieldset data-role="controlgroup"><input type="range" class="slider" name="slider" value="0" min="0" max="100" data-highlight="false"></fieldset></div></center><div class="ui-grid-a"><div class="ui-block-a"><a id=SaveChangesCesta data-role="button" type="submit" >Guardar cambios</a></div><div class="ui-block-b"><a id="DeleteCesta" type="submit" >Eliminar de cesta</a></div></div></div></div><br><br>');
    });
}

Thanks!

Working example: http://jsfiddle.net/Gajotres/6nG2n/

You are combining several different widgets, to enhance their markup you should run trigger('create').

Read more about it in my other answer: jQuery Mobile: Markup Enhancement of dynamically added content

$('[data-role="content"]').append('<div data-role="collapsible-set" id="collapsible" data-theme="a" data-content-theme="c"><div data-role="collapsible" data-collapsed="false"><h3 id="title_collapsible">Image</h3><center><div id=image_cesta><img src=data:imajpeg;base64,Image alt="image"></div><div data-role="fieldcontain"><fieldset data-role="controlgroup"><input type="range" class="slider" name="slider" value="0" min="0" max="100" data-highlight="false"></fieldset></div></center><div class="ui-grid-a"><div class="ui-block-a"><a id=SaveChangesCesta data-role="button" type="submit" >Guardar cambios</a></div><div class="ui-block-b"><a id="DeleteCesta" type="submit" >Eliminar de cesta</a></div></div></div></div><br><br>');   
$('#index').trigger('create');