BUG 7538 need cancel button on the bottom of the Post Note function

this option was added at the end of that window because there is an close option on the top this window near to the post note button.

workflow/engine/templates/cases/caseUtils.js

@@ -153,9 +153,13 @@ caseNotesWindow = new Ext.Window({
     statusAlign: 'left',
 
     // any standard Toolbar items:
-    items: []
+    items: [{
+             text: _('ID_CANCEL'),
+             handler: function(){
+              caseNotesWindow.close();
+             }
+            }]
   })
-
   ],
   tbar:[{
     //xtype:'textfield',
@@ -421,4 +425,4 @@ var openSummaryWindow = function(applicationUID, delegation) {
   });
   summaryWindow.show();
 };
-/* Case Summary - End*/
+/* Case Summary - End*/