diff --git a/ui/scripts/ui/dialog.js b/ui/scripts/ui/dialog.js
index f7946dc8a95..332b78f775c 100644
--- a/ui/scripts/ui/dialog.js
+++ b/ui/scripts/ui/dialog.js
@@ -237,7 +237,10 @@
 
                             if (($target.is(':checked') && !isReverse) ||
                                 ($target.is(':unchecked') && isReverse)) {
-                                $dependent.css('display', 'inline-block');
+                                
+                            	$dependent.css('display', 'inline-block'); //show dependent dropdown field
+                                $dependent.change(); //trigger event handler for default option in dependent dropdown field (CLOUDSTACK-7826)
+                                
                                 $dependent.each(function() {
                                     if ($(this).data('dialog-select-fn')) {
                                         $(this).data('dialog-select-fn')();