Index: /CKEditor/branches/features/aria/_source/plugins/dialog/plugin.js
===================================================================
--- /CKEditor/branches/features/aria/_source/plugins/dialog/plugin.js	(revision 5047)
+++ /CKEditor/branches/features/aria/_source/plugins/dialog/plugin.js	(revision 5048)
@@ -415,5 +415,10 @@
 		this.on( 'show', function()
 			{
-				if ( !this._.hasFocus )
+				if( editor.config.dialog_startupFocusTab )
+				{
+					me._.tabBarMode = true;
+					me._.tabs[ me._.currentTabId ][ 0 ].focus();
+				}
+				else if ( !this._.hasFocus )
 				{
 					this._.currentFocusIndex = -1;
@@ -2837,4 +2842,13 @@
 
 /**
+ * If the dialog has more than one tab, put focus into the first tab as soon as dialog is opened.
+ * @name CKEDITOR.config.dialog_startupFocusTab
+ * @type Boolean
+ * @default false
+ * @example
+ * config.dialog_startupFocusTab = true;
+ */
+
+/**
  * The distance of magnetic borders used in moving and resizing dialogs,
  * measured in pixels.