OnGroupExpanding

Sys.CancelEventArgs OnGroupExpanding Property

To get or set property values for client API properties, you must call property accessor methods that are named with the get_ and set_ prefixes. For example, to get or set a value for a property such as cancel, you call the get_cancel or set_cancel.

This event is fired before a row is shown.

Fired by	RadGrid
Arguments	N/A
Can be canceled	Yes, set eventArgs.set_cancel(true) to cancel

Example:

<telerik:RadGrid RenderMode="Lightweight" ID="RadGrid1" runat="server">
    <ClientSettings>
        <ClientEvents OnGroupExpanding="GroupExpanding" />
    </ClientSettings>
</telerik:RadGrid>

function GroupExpanding(sender, eventArgs) {
    alert("GroupExpanding is fired");
}