Clickable L.control on leaflet

I am trying to add a L.Control element to my leaflet map. However once I added the element to my map, I noticed that its not clickable. I would like to display a form inside this L.Control element, however I cant select any elements from my drop down menus, since the clicks always go through to the map.

Here a JSfiddle: http://ift.tt/1wd5lGr

as well as my JS code:

var map = L.map('map').setView([0.27, 37.66], 6);

        // add an OpenStreetMap tile layer
        L.tileLayer('http://ift.tt/1lSj3Er', {
        attribution: '&copy; <a href="http://ift.tt/VGR6Z6">OpenStreetMap</a> contributors'
        }).addTo(map);


        var mainMenu = L.Control.extend({
                options: {position: 'topright'},

        onAdd : function (map) { 
                this._div = L.DomUtil.create('div', 'mainMenu');
                this._div.innerHTML =  '<h3>Main Menu</h3>';

        this._div.innerHTML +=  '<h4>Data:</h4> MODIS NDVI <h4>AOI:</h4> Kenya, Africa <br><br>'
        this._div.innerHTML +=  '<h4>Indicator:</h4>'
        this._div.innerHTML +=  '<form><form id="form" class="form" action="" method="POST">' +
                        '<select name="indicator"><option value="NDVI_ABS">NDVI<br>' + 
                        '<option value="NDVI_VCI">VCI<br>' +
                        '<option value="RAIN_ABS">Precipitation<br>' +
                        '</select>';                        
        this._div.innerHTML += '<input type="submit" value="Refresh Map"  name="submit"></form>';   
        return this._div;     
                },                                  
        });
        map.addControl(new mainMenu());

Any suggestions on how to make it clickable?