Index: core/units/admin/admin_tag_processor.php
===================================================================
--- core/units/admin/admin_tag_processor.php
+++ core/units/admin/admin_tag_processor.php
@@ -485,8 +485,16 @@
 			}
 
 			if ($pass_through) {
-				// add pass_through to selector url if any
-				$params['pass_through'] = implode(',', array_keys($pass_through));
+				// Add pass_through to selector url if any.
+				$pass_through_string = implode(',', array_keys($pass_through));
+
+				if ( isset($params['pass_through']) ) {
+					$params['pass_through'] .= ',' . $pass_through_string;
+				}
+				else {
+					$params['pass_through'] = $pass_through_string;
+				}
+
 				$params = array_merge($params, $pass_through);
 			}
 
@@ -1115,4 +1123,4 @@
 		{
 			return $this->Application->isCachingType(CACHING_TYPE_MEMORY);
 		}
-	}
\ No newline at end of file
+	}