added style

src/module/layout.js

@@ -132,7 +132,11 @@ KityMinder.registerModule( "LayoutModule", function () {
 			base: Command,
 			execute: function ( km ) {
 				var selectedNodes = km.getSelectedNodes();
-				if ( selectedNodes.length === 0 ) return false;
+				var _root = km.getRoot();
+				if ( selectedNodes.length === 0 || ( selectedNodes.length === 1 && !selectedNodes[ 0 ].getParent() ) ) {
+					km.select( _root );
+					return false;
+				}
 				var _buffer = [];
 				for ( var i = 0; i < selectedNodes.length; i++ ) {
 					_buffer.push( selectedNodes[ i ] );

themes/default/_css/dialogsize.css

-.kmui-modal-header .kmui-title{
-	font-size: 14px;
-}
-.kmui-dialog-markers-body {
-    padding-bottom: 5px
-}
-.icon-list{
-    margin: 0;
-    padding: 0
-}
-.icon-list li{
-    padding: 5px 10px;
-    margin: 0;
-    list-style: none;
-    cursor: pointer;
-    color: #333
-}
-.icon-list li:hover,.icon-list li.active{
-    background: #cfe0f7
-}
-.icon-list li span.icon{
-	display: inline-block;
-	width: 20px;
-	height: 20px;
-    vertical-align: middle;
-    margin-right: 10px;
-}
\ No newline at end of file

themes/default/_css/import.css

@@ -11,3 +11,4 @@
 @import "tooltip.css";
 @import "colorpicker.css";
 @import "separator.css";
+@import "markers.css";

themes/default/_css/markers.css

+.kmui-modal-header .kmui-title{
+	font-size: 14px;
+}
+.kmui-dialog-markers-body {
+    padding-bottom: 5px
+}
+.icon-list{
+    margin: 0;
+    padding: 0
+}
+.icon-list li{
+    padding: 5px 10px;
+    margin: 0;
+    list-style: none;
+    cursor: pointer;
+    color: #333
+}
+.icon-list li:hover,.icon-list li.active{
+    background: #cfe0f7
+}
+.icon-list li span.icon{
+	display: inline-block;
+	width: 20px;
+	height: 20px;
+    vertical-align: middle;
+    margin-right: 10px;
+}
\ No newline at end of file