Hello Bob Duffy,
The server-side event that is raised is Command. You can handle it the following way:
1. Attach a handler in code-behind:
dock1.Command += new DockCommandEventHandler(dock_Command);OR
attach a handler in ASPX:
<telerik:raddock id="dock1" runat="server" defaultcommands="ExpandCollapse" oncommand="dock_Command"
2. Handle the Command
void dock_Command(object sender, DockCommandEventArgs e)
if(e.Command.Name == "ExpandCollapse")
//your logic here
Make sure you set CommandsAutoPostback="true" so that upon clicking Collapse/Expand a postback wll be initiated.
You can also handle the command client-side by specifying the OnClientCommand property of RadDock. Let me know if you need further assistance with this.
the Telerik team