diff --git a/src/scripts/controllers/main.js b/src/scripts/controllers/main.js
index 0bae756..e34f28b 100644
--- a/src/scripts/controllers/main.js
+++ b/src/scripts/controllers/main.js
@@ -215,6 +215,10 @@
             });
         };
 
+        $scope.isAllTasksSelected = function () {
+            return $rootScope.taskContext.isAllSelected();
+        };
+
         $scope.selectAllTasks = function () {
             $rootScope.taskContext.selectAll();
         };
diff --git a/src/scripts/core/root.js b/src/scripts/core/root.js
index 9ca9782..81bd981 100644
--- a/src/scripts/core/root.js
+++ b/src/scripts/core/root.js
@@ -133,15 +133,7 @@
 
                 return result;
             },
-            selectAll: function () {
-                if (!this.list || !this.selected || this.list.length < 1) {
-                    return;
-                }
-
-                if (!this.enableSelectAll) {
-                    return;
-                }
-
+            isAllSelected: function () {
                 var isAllSelected = true;
 
                 for (var i = 0; i < this.list.length; i++) {
@@ -153,6 +145,19 @@
                     }
                 }
 
+                return isAllSelected;
+            },
+            selectAll: function () {
+                if (!this.list || !this.selected || this.list.length < 1) {
+                    return;
+                }
+
+                if (!this.enableSelectAll) {
+                    return;
+                }
+
+                var isAllSelected = this.isAllSelected();
+
                 for (var i = 0; i < this.list.length; i++) {
                     var task = this.list[i];
                     this.selected[task.gid] = !isAllSelected;