diff --git a/app/css/app.css b/app/css/app.css
index 20148ed..f14d9d9 100644
--- a/app/css/app.css
+++ b/app/css/app.css
@@ -72,10 +72,15 @@ h1.title {
     visibility: hidden;
 }
 
-.ship:hover button {
+.ship:hover button,
+.ship:hover .input-group {
     visibility: visible;
 }
 
+.ship .input-group {
+  visibility: hidden;
+}
+
 .ship span.price {
     position: absolute;
     background: rgb(38, 121, 21);
@@ -129,6 +134,13 @@ h1.title {
     clear: both;
 }
 
+#enableSales {
+  float: left;
+  clear: both;
+  display: block;
+  width: 100%;
+}
+
 #enableSales span {
     position: relative;
     top: -5px;
diff --git a/app/js/components/addToken.js b/app/js/components/addToken.js
index 5dc68e5..4bffa19 100644
--- a/app/js/components/addToken.js
+++ b/app/js/components/addToken.js
@@ -68,6 +68,8 @@ class AddToken extends Component {
         this.props.loadShipsForSale();
 
         // TODO: show success
+
+        return true;
       })
       .catch((err) => {
         console.error(err);
diff --git a/app/js/components/ship.js b/app/js/components/ship.js
index 4c140d5..a59d35b 100644
--- a/app/js/components/ship.js
+++ b/app/js/components/ship.js
@@ -63,7 +63,7 @@ class Ship extends Component {
             })
             .then(receipt => {
                 console.log(receipt);
-
+                
                 this.props.onAction();
 
                 // TODO: show success
@@ -79,7 +79,7 @@ class Ship extends Component {
     }
 
     render(){
-        const { energy, lasers, shield, price, wallet } = this.props;
+        const { energy, lasers, shield, price, wallet, salesEnabled } = this.props;
         const { image, isSubmitting, showSellForm } = this.state;
         
         const formattedPrice = !wallet ? web3.utils.fromWei(price, "ether") : '';
@@ -95,7 +95,7 @@ class Ship extends Component {
             </ul>
             { !wallet 
                 ? <Button disabled={isSubmitting} bsStyle="success" onClick={this.buyShip}>Comprar</Button> 
-                : (!showSellForm 
+                : (!showSellForm && salesEnabled
                     ? <Button bsStyle="success" onClick={e => { this.showSellForm(true) }}>Vender</Button>
                     : '')
              }
diff --git a/app/js/components/shipList.js b/app/js/components/shipList.js
index 3347276..81dd4da 100644
--- a/app/js/components/shipList.js
+++ b/app/js/components/shipList.js
@@ -11,7 +11,8 @@ class ShipList extends Component {
   constructor(props){
     super(props);
     this.state = {
-      isSubmitting: false
+      isSubmitting: false,
+      salesEnabled: false
     }
   }
 
@@ -30,7 +31,7 @@ enableMarketplace = () => {
     const { setApprovalForAll } = SpaceshipToken.methods;
 
     this.setState({isSubmitting: true});
-
+console.log(SpaceshipMarketplace);
     const toSend = setApprovalForAll(SpaceshipMarketplace.options.address, !this.state.salesEnabled);
 
     toSend.estimateGas()
@@ -54,9 +55,12 @@ enableMarketplace = () => {
 
   render = () => {
     const { list, title, id, wallet, onAction } = this.props;
+    const { salesEnabled } = this.state;
+
     return <div id={id}>
-      <h3>{title}</h3> { wallet ? <EnableSales isSubmitting={this.state.isSubmitting} handleChange={this.enableMarketplace} salesEnabled={this.state.salesEnabled} /> : ''}
-      { list.map((ship, i) => <Ship onAction={onAction} wallet={wallet} key={i} {...ship} />) }
+      <h3>{title}</h3> 
+      { wallet ? <EnableSales isSubmitting={this.state.isSubmitting} handleChange={this.enableMarketplace} salesEnabled={this.state.salesEnabled} /> : ''}
+      { list.map((ship, i) => <Ship onAction={onAction} wallet={wallet} salesEnabled={salesEnabled} key={i} {...ship} />) }
       </div>;
   }
 
diff --git a/contracts/SpaceshipMarketplace.sol b/contracts/SpaceshipMarketplace.sol
index fcc49b6..b4d6301 100644
--- a/contracts/SpaceshipMarketplace.sol
+++ b/contracts/SpaceshipMarketplace.sol
@@ -1,10 +1,10 @@
 pragma solidity 0.4.24;
 
 import "./SpaceshipToken.sol";
-import "zeppelin-solidity/contracts/token/ERC721/ERC721Receiver.sol";
+import "zeppelin-solidity/contracts/token/ERC721/ERC721Holder.sol";
 
 
-contract SpaceshipMarketplace is ERC721Receiver {
+contract SpaceshipMarketplace is ERC721Holder {
 
     // Esta estructura guarda informacion sobre las ventas
     struct Sale {
@@ -23,7 +23,7 @@ contract SpaceshipMarketplace is ERC721Receiver {
     event ShipSold(uint indexed spaceshipId, uint price, address indexed oldOwner, address indexed newOwner);
 
 
-    constructor(SpaceshipToken _token) public{
+    constructor(SpaceshipToken _token) public {
         token = _token;
     }