TKD AddProtocolCommand example

Wed, 14 May 2014 14:28:02 -0700 

Hello

Could someone provide an example how to use addProtocolCommand?

The following is how I would expect it to work:

import tkd.tkdapplication;   // Import Tkd.
class Application : TkdApplication // Extend TkdApplication. 
{
private void exitCommand(CommandArgs args) // Create a callback. 
    {
this.exit(); // Exit the application. 
    }

    private void saveMeCommand(CommandArgs args)
    {
        new MessageDialog(this.mainWindow,"Saving...")
            .setMessage("Bye")
            .show();
    }
override protected void initInterface() // Initialise user interface. 
    {
this.mainWindow.addProtocolCommand(WindowProtocol.saveYourself, &this.saveMeCommand);
auto frame = new Frame(2, ReliefStyle.groove) // Create a frame. .pack(10); // Place the frame.
auto label = new Label(frame, "Hello World!") // Create a label. .pack(10); // Place the label.
auto exitButton = new Button(frame, "Exit") // Create a button. .setCommand(&this.exitCommand) // Use the callback. 
            .underlineChar(1)
.pack(10); // Place the button. 

    }

}

void main(string[] args)
{
    auto app = new Application(); // Create the application.
app.run(); // Run the application. 
}


I get the following when I try to compile:
tkd\window\window.d(426): Error: undefined identifier CommandCallback main.d(21): Error: template tkd.window.window.Window.addProtocolCommand cannot deduce function from argument types !()(WindowProtocol, void delegate(CommandArgs args)), candidates are: tkd\window\window.d(426): tkd.window.window.Window.addProtocolCommand(this T)(string protocol, CommandCallback callback)
If I comment out the line where I try to add the command, it compiles and runs fine:

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