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This event is fired just before a command is executed.

function OnClientCommandExecuting(editor, args)
editor object Returns a reference to RadEditor client object
args object Returns the needed information about the event
args parameter methods
args.get_commandName() Returns the command name
args.get_value() Returns the value of the executed tool
args.set_value() Sets the new content to be pasted in RadEditor
args.get_cancel() Returns Boolean value that indicates whether the event has been canceled or not.
args.set_cancel(true) Cancels the command execution

The following example demonstrates how to alert the selected dropdown item name and value:

<script type="text/javascript">
    function OnClientCommandExecuting(editor, args)
        //The command name    
        var commandName = args.get_commandName();               
        //The tool that initiated the command    
        var tool = args.get_tool();                   
        //The selected value [if command is coming from a dropdown]    
        var value = args.get_value();           

        //Perform some action     
        var message = "OnClientCommandExecuting.\nSelected value: " + value;                                           
        var answer = confirm(message + "\nExecute command " + commandName +"?");
        //Cancel the command execution by calling args.set_cancel(true);    
<telerik:RadEditor RenderMode="Lightweight" runat="server" ID="RadEditor1" OnClientCommandExecuting="OnClientCommandExecuting">