diff --git a/application/applicationextension.inc.php b/application/applicationextension.inc.php
index 916ae0db9..188298dc8 100644
--- a/application/applicationextension.inc.php
+++ b/application/applicationextension.inc.php
@@ -225,6 +225,33 @@ interface iPreferencesExtension
 	public function ApplyPreferences(WebPage $oPage, $sOperation);
 }
 
+/**
+ * Extend this class instead of implementing iPreferencesExtension if you don't need to overload all methods
+ *
+ * @api
+ * @package     Extensibility
+ * @since       2.7.0
+ */
+abstract class AbstractPreferencesExtension implements iPreferencesExtension
+{
+	/**
+	 * @inheritDoc
+	 */
+	public function DisplayPreferences(WebPage $oPage)
+	{
+		// Do nothing
+	}
+
+	/**
+	 * @inheritDoc
+	 */
+	public function ApplyPreferences(WebPage $oPage, $sOperation)
+	{
+		// Do nothing
+	}
+
+}
+
 /**
  * Implement this interface to change the behavior of the GUI for some objects.
  *
@@ -385,6 +412,81 @@ interface iApplicationUIExtension
 	public function EnumAllowedActions(DBObjectSet $oSet);
 }
 
+/**
+ * Extend this class instead of implementing iApplicationUIExtension if you don't need to overload
+ *
+ * @api
+ * @package     Extensibility
+ * @since       2.7.0
+ */
+abstract class AbstractApplicationUIExtension implements iApplicationUIExtension
+{
+	/**
+	 * @inheritDoc
+	 */
+	public function OnDisplayProperties($oObject, WebPage $oPage, $bEditMode = false)
+	{
+		return;
+	}
+
+	/**
+	 * @inheritDoc
+	 */
+	public function OnDisplayRelations($oObject, WebPage $oPage, $bEditMode = false)
+	{
+		return;
+	}
+
+	/**
+	 * @inheritDoc
+	 */
+	public function OnFormSubmit($oObject, $sFormPrefix = '')
+	{
+		return;
+	}
+
+	/**
+	 * @inheritDoc
+	 */
+	public function OnFormCancel($sTempId)
+	{
+		return;
+	}
+
+	/**
+	 * @inheritDoc
+	 */
+	public function EnumUsedAttributes($oObject)
+	{
+		return array();
+	}
+
+	/**
+	 * @inheritDoc
+	 */
+	public function GetIcon($oObject)
+	{
+		return '';
+	}
+
+	/**
+	 * @inheritDoc
+	 */
+	public function GetHilightClass($oObject)
+	{
+		return HILIGHT_CLASS_NONE;
+	}
+
+	/**
+	 * @inheritDoc
+	 */
+	public function EnumAllowedActions(DBObjectSet $oSet)
+	{
+		return array();
+	}
+
+}
+
 /**
  * Implement this interface to perform specific things when objects are manipulated
  *
@@ -482,6 +584,65 @@ interface iApplicationObjectExtension
 	public function OnDBDelete($oObject, $oChange = null);
 }
 
+/**
+ * Extend this class instead of iApplicationObjectExtension if you don't need to overload all methods
+ *
+ * @api
+ * @package     Extensibility
+ * @since       2.7.0
+ */
+abstract class AbstractApplicationObjectExtension implements iApplicationObjectExtension
+{
+	/**
+	 * @inheritDoc
+	 */
+	public function OnIsModified($oObject)
+	{
+		return false;
+	}
+
+	/**
+	 * @inheritDoc
+	 */
+	public function OnCheckToWrite($oObject)
+	{
+		return array();
+	}
+
+	/**
+	 * @inheritDoc
+	 */
+	public function OnCheckToDelete($oObject)
+	{
+		return array();
+	}
+
+	/**
+	 * @inheritDoc
+	 */
+	public function OnDBUpdate($oObject, $oChange = null)
+	{
+		return;
+	}
+
+	/**
+	 * @inheritDoc
+	 */
+	public function OnDBInsert($oObject, $oChange = null)
+	{
+		return;
+	}
+
+	/**
+	 * @inheritDoc
+	 */
+	public function OnDBDelete($oObject, $oChange = null)
+	{
+		return;
+	}
+
+}
+
 /**
  * New extension to add menu items in the "popup" menus inside iTop. Provides a greater flexibility than
  * iApplicationUIExtension::EnumAllowedActions.
@@ -869,6 +1030,41 @@ interface iPageUIExtension
 	public function GetBannerHtml(iTopWebPage $oPage);
 }
 
+/**
+ * Extend this class instead of iPageUIExtension if you don't need to overload all methods
+ *
+ * @api
+ * @package     Extensibility
+ * @since       2.7.0
+ */
+abstract class AbstractPageUIExtension implements iPageUIExtension
+{
+	/**
+	 * @inheritDoc
+	 */
+	public function GetNorthPaneHtml(iTopWebPage $oPage)
+	{
+		return '';
+	}
+
+	/**
+	 * @inheritDoc
+	 */
+	public function GetSouthPaneHtml(iTopWebPage $oPage)
+	{
+		return '';
+	}
+
+	/**
+	 * @inheritDoc
+	 */
+	public function GetBannerHtml(iTopWebPage $oPage)
+	{
+		return '';
+	}
+
+}
+
 /**
  * Implement this interface to add content to any enhanced portal page
  *