dispatchController.js

// ==========================================================================
// Kitchen.DispatchController
// ==========================================================================

require('core');

/** @class

  (Document Your View Here)

  @extends SC.CollectionController
  @author AuthorName
  @version 0.1
  @static
*/
Kitchen.dispatchController = SC.CollectionController.create(
/** @scope Kitchen.dispatchController */ {

  // TODO: Add your own code here.
	remove_from_dispatch_list: function (event, target) {
		if(target){
			var item = target.get('content');
			if(item){
				item.set('produced', item.get('produced') - 1);
				item.set('quantity', item.get('quantity') + 1);
			}
		} 
	},

	enableDispatchButtons: false,
	
	_arrangedObjectsObserver: function(){
		var arrangedObjects = this.get('arrangedObjects');
		if((arrangedObjects) && (arrangedObjects instanceof Array)){
			if(arrangedObjects.length>0){
				this.set('enableDispatchButtons',true);
			} 
			else {
				this.set('enableDispatchButtons',false);
			}
		}
	}.observes('arrangedObjects')
}) ;

footer.rhtml

<% content_for('body') do %>
	<% view :footer, :class => 'sc-footer sc-square-theme' do %>
		<% view :class => 'dispatch_allign' do %>
		<%= button_view :cancel_dispatch_button, 
						:class => 'fix_button',
						:width => 100,
						:label => 'Cancel', 
						:bind => {
							:enabled => 'Kitchen.dispatchController.enableDispatchButtons'
						} %>
		<%= button_view :dispatch_button, 
						:class => 'fix_button',
						:label => 'Dispatch', 
						:bind => {
							:enabled => 'Kitchen.dispatchController.enableDispatchButtons'
						} %>
		<% end %>
	<% end %>
<% end %>