You can control where the grouping will be handled using the <b>GroupLoadMode</b> property 
of the <b>GridTableView</b> instance. There are two options:
<br/>
 - Server-side - <b>GridTableView.GroupLoadMode.Server</b> - this is the default behavior. 
   Groups are expanded after postback to the server for example: <br/>
<br/>
   <b>&lt;MasterTableView GroupLoadMode="Server"&gt;</b> 
<br/>
<br/>
 - Client-side - <b>GridTableView.GroupLoadMode.Client</b> - Groups will be expanded 
   client-side and no postback will be performed.
<br/>
<br/>
  <b>&lt;MasterTableView GroupLoadMode="Client"&gt; </b>
<br/>
<br/>
and set the <b>ClientSettings -> AllowGroupExpandCollapse</b> attribute to <b>true</b>:
<br/>
<br/>
<b>&lt;ClientSettings AllowGroupExpandCollapse="True"&gt;</b>
<br/>
<br/>
This example demonstrates OutlookŪ - style grouping implemented with Telerik RadGrid 
client-side Expand/Collapse of groups.