diff -r 96f84344a70e -r 04b7d46e9d67 client/js/renderer/noderepr.js
--- a/client/js/renderer/noderepr.js	Fri May 22 17:45:50 2015 +0200
+++ b/client/js/renderer/noderepr.js	Fri May 22 17:48:18 2015 +0200
@@ -33,6 +33,7 @@
                                        new Renderer.NodeEditButton(this.renderer, null),
                                        new Renderer.NodeRemoveButton(this.renderer, null),
                                        new Renderer.NodeHideButton(this.renderer, null),
+                                       new Renderer.NodeShowButton(this.renderer, null),
                                        new Renderer.NodeLinkButton(this.renderer, null),
                                        new Renderer.NodeEnlargeButton(this.renderer, null),
                                        new Renderer.NodeShrinkButton(this.renderer, null)
@@ -367,6 +368,8 @@
             //if the node is hidden and the mouse hover it, it appears as a ghost
             if (this.hidden){
                 this.show(true);
+            }else{
+                this.showNeighbors(true);
             }
             this._super("select");
         },
@@ -389,6 +392,8 @@
                 //when the mouse don't hover the node anymore, we hide it
                 if (this.hidden){
                     this.hide();
+                }else{
+                    this.hideNeighbors();
                 }
                 this._super("unselect");
             }
@@ -419,6 +424,7 @@
                         }
                     }
             );
+            this.hideNeighbors();
         },
         show: function(ghost){
             var _this = this;
@@ -449,6 +455,44 @@
                     }
             );            
         },
+        hideNeighbors: function(){
+            var _this = this;
+            _.each(
+                    this.project.get("edges").filter(
+                            function (ed) {
+                                return (ed.get("from") === _this.model);
+                            }
+                    ),
+                    function(edge, index, list) {
+                        var repr = _this.renderer.getRepresentationByModel(edge.get("to"));
+                        if (repr && repr.ghost) {
+                            repr.hide();
+                        }
+                    }
+            );
+        },
+        showNeighbors: function(ghost){
+            var _this = this;
+            _.each(
+                    this.project.get("edges").filter(
+                            function (ed) {
+                                return (ed.get("from") === _this.model);
+                            }
+                    ),
+                    function(edge, index, list) {
+                        var repr = _this.renderer.getRepresentationByModel(edge.get("to"));
+                        if (repr && repr.hidden) {
+                            repr.show(ghost);
+                            if (!ghost){
+                                var indexNode = _this.renderer.hiddenNodes.indexOf(repr.model.id);
+                                if (indexNode !== -1){
+                                    _this.renderer.hiddenNodes.splice(indexNode, 1);
+                                }
+                            }
+                        }
+                    }
+            );
+        },
         highlight: function(textToReplace) {
             var hlvalue = textToReplace || true;
             if (this.highlighted === hlvalue) {