update docs and enhance grid to run code

docs/grids/enhanced-grid-view.md

@@ -7,8 +7,8 @@ to set behaviors dynamically on configuration.
 On `renderSection()` the behaviors methods take priority over the GridView's thus providing a runtime override 
 mechanism. 
 
-At the end of `run()` method, it also checks if any of its behaviors extends from `RegistersClientScriptInterface` so 
-to register any javascript required.
+At the end of `run()` method, it checks if any of its behaviors implement `RegistersClientScriptInterface` so 
+to register any javascript required and if they implements `RunnableBehaviorInterface` to run its internal code.
 
 There is really not much more to say about this widget and thats the beauty of it. You should check 
 [how to create behaviors](../guides/how-to-create-behaviors.md) guide to find out how to extend this great piece of 

src/GridView.php

@@ -10,6 +10,7 @@
 namespace dosamigos\grid;
 
 use dosamigos\grid\contracts\RegistersClientScriptInterface;
+use dosamigos\grid\contracts\RunnableBehaviorInterface;
 use yii\base\Behavior;
 use yii\helpers\ArrayHelper;
 use yii\helpers\Html;
@@ -81,13 +82,13 @@ public function run()
     {
         parent::run();
 
-        $this->registerClientScript();
+        $this->runBehaviors();
     }
 
     /**
-     * Registers required client scripts of behaviors
+     * Runs behaviors, registering their scripts if necessary
      */
-    protected function registerClientScript()
+    protected function runBehaviors()
     {
         $behaviors = $this->getBehaviors();
 
@@ -96,6 +97,9 @@ protected function registerClientScript()
                 if ($behavior instanceof RegistersClientScriptInterface) {
                     $behavior->registerClientScript();
                 }
+                if($behavior instanceof RunnableBehaviorInterface) {
+                    $behavior->run();
+                }
             }
         }
     }

src/contracts/RunnableBehaviorInterface.php

@@ -0,0 +1,11 @@
+<?php
+
+namespace dosamigos\grid\contracts;
+
+interface RunnableBehaviorInterface
+{
+    /**
+     * Runs code on render.
+     */
+    public function run();
+}