Update release notes

git-svn-id: http://root.cern.ch/svn/root/trunk@28329 27541ba8-7e3a-0410-8455-c3a389f83636

gui/doc/v524/index.html

@@ -8,3 +8,38 @@
 <li> In <tt>SetWindowSize</tt> the event queue is flushed to make sure
      the window size change is really done.
 </ul>
+
+<h4>TRootContextMenu</h4>
+<ul>
+<li> When creating the dialog from the context menu, skip arguments that are pointers (but not char *) and have a default value. This should avoid confusing input fields in dialog.
+<li> Implemented online help in root dialogs (the dialog boxes used with contextual menus) via a new "Online Help" button. This opens a Root HTML browser at the right class/method location in the Root reference guide on the web.
+<br> The base url can be changed with the Browser.StartUrl option in system.rootrc (by default: http://root.cern.ch/root/html/ClassIndex.html)
+<li> Added a small '?' on the right of the context menu entries, giving access to online help
+</ul>
+
+<h4>TGMenu</h4>
+<ul>
+<li> Add possibility to add a right aligned shortcut by using a tab character ('\t') before the shortcut string, as shown below:
+<br>   fMenuFile->AddEntry("&Open...\tCtrl+O", kOpenFile);
+<li> Use new way of adding right aligned shortcuts in the menu entries in most of the GUI classes using shortcuts in their menu
+</ul>
+
+<h4>TGSlider</h4>
+<ul>
+<li> Added HandleConfigureNotify() to handle resizing events.
+</ul>
+
+<h4>New Browser</h4>
+<ul>
+<li> Automatically browse ROOT files if there is any open when starting the browser.
+</ul>
+
+<br> 
+<hr> 
+<a name="guihtml"></a> 
+<h3>GUIHTML</h3>
+
+<h4>TGHtmlBrowser</h4>
+<ul>
+<li> Added ability to display single picture from the web and to open pdf files with external viewer (Windows only)
+</ul>