diff --git a/etemplate/js/et2_core_common.js b/etemplate/js/et2_core_common.js
index c5b1335e2b..176d3a07d0 100644
--- a/etemplate/js/et2_core_common.js
+++ b/etemplate/js/et2_core_common.js
@@ -753,8 +753,8 @@ function et2_rangeSubstract(_ar1, _ar2)
 /**
  * Call a function specified by it's name (possibly dot separated, eg. "app.myapp.myfunc")
  *
- * @param string func dot-separated function name
- * @param arguments variable number of arguments
+ * @param {string} _func dot-separated function name
+ * variable number of arguments
  * @returns {Boolean}
  */
 function et2_call(_func)
@@ -767,9 +767,17 @@ function et2_call(_func)
 	{
 		var parts = _func.split('.');
 		func = parts.pop();
-		for(var i=0; i < parts.length && typeof parent[parts[i]] != 'undefined'; ++i)
+		for(var i=0; i < parts.length; ++i)
 		{
-			parent = parent[parts[i]];
+			if (typeof parent[parts[i]] != 'undefined')
+			{
+				parent = parent[parts[i]];
+			}
+			// check if we need a not yet instanciated app.js object --> instanciate it now
+			else if (i == 1 && parts[0] == 'app' && typeof window.app.classes[parts[1]] == 'function')
+			{
+				parent = parent[parts[1]] = new window.app.classes[parts[1]]();
+			}
 		}
 		if (typeof parent[func] == 'function')
 		{