compute a template to render

gistfile1.js

Template.editProperty.helpers({
    // Render a template based on the control type.  For example, if
    // this.control.type is 'color', it will render the template with
    // name="colorControl", if it exists.  'this' context is passed to
    // the control sub-template when rendering.
    renderControl: function() {
        if ( ! (this.control && this.control.type)) 
            throw new Meteor.Error(500, 'type missing');
        
        var template = Template[this.control.type + 'Control'];
        if (template)
            return new Handlebars.SafeString(template(this));
    }
});