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This is what I found with a little help from Telerik Support. In the ClientSetting of the RadGrid add a method to the ClientEvents OnDataBinding. My name method name is OnClientDataBinding in this example Then create the client method: <pre><code> // This OnClient DataBinding builds the arguments uses to call the // Ajax Service used to retrieve that when needed. function OnClientDataBinding(sender, args) { // get data source location, method name and arguments var dataSourceLocation = args.get_location(); var selectMethodName = args.get_methodName(); var methodArguments = args.get_methodArguments(); ... </code></pre> I actually modified the sortExpression and fitlerExpresion and these are passed as an Array. <pre><code> // construct arguments for Ajax Service var myMethodArguments = new Object(); myMethodArguments.startRowIndex = methodArguments.startRowIndex; myMethodArguments.maximumRows = methodArguments.maximumRows; myMethodArguments.sortExpression = sortExpression; myMethodArguments.filterExpression = filterExpression; myMethodArguments.myParam1 = "David"; myMethodArguments.myParam2 = 14926; args.set_methodArguments(myMethodArguments); } </code></pre> Then create your Service Controller Method something like: <pre><code>public JsonResult GetCustomerSearchResults(int startRowIndex, int maximumRows, string sortExpression, FilterExpression[] filterExpression, string myParam1, int myParam2) { IEnumerable results; ... fill your Data and Count. return Json(new { Data = results.ToList(), Count = totalNumberOfRows }); } </code></pre> FilterExpression[] is an object that I created for my use. This is not a Telerik object.
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A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.