How to associate with Javascript in the Monomac Code(c #)

when I transform objective-c code into monomac（c#） code ,I meet with a problem that how to Calling ObjC from JavaScript ,in obj-c the code as follows:

+ (NSString*)webScriptNameForSelector:(SEL)sel
{
    if (sel == @selector(dataDidChange)) return @"dataDidChange";
    if (sel == @selector(instanceReady)) return @"instanceReady";
    if (sel == @selector(openColorPanel)) return @"openColorPanel";
    if (sel == @selector(openFontPanel)) return @"openFontPanel";
    return nil;
}

+ (BOOL)isSelectorExcludedFromWebScript:(SEL)sel
{
    if (sel == @selector(dataDidChange)) return NO;
    if (sel == @selector(instanceReady)) return NO;
    if(sel == @selector(openColorPanel)) return NO;
    if(sel == @selector(openFontPanel)) return NO;
    return YES;
}


- (void) openColorPanel {
    [[NSColorPanel sharedColorPanel] orderFront:self];
    // No need to do anything else. Selected text color is changed auto-magically. See: http://stackoverflow.com/questions/12543320/ckeditor-and-nscolorpanel-a-mystery
}

- (void) openFontPanel {
    [[NSFontPanel sharedFontPanel] orderFront:self];
    // No need to do anything else. Selected font is changed auto-magically. See: http://stackoverflow.com/questions/12543320/ckeditor-and-nscolorpanel-a-mystery    
}

in the Objective-c code ,the application can work normally,however,when I translate these codes into monomac like downside,it can't work,I debug in the IDE,find that when application execute,it never enter into these methods,so I doubt that the monomac code don't associate with Javascript code successfully.

static string webScriptNameForSelector(MonoMac.ObjCRuntime.Selector sel)
{
    Console.WriteLine("@@@@@@");
    if (sel == new MonoMac.ObjCRuntime.Selector("dataDidChange"))

    {
        return "dataDidChange";

    }
    if (sel == new MonoMac.ObjCRuntime.Selector ("instanceReady")) 
    {
        return "instanceReady";

    }
    if (sel == new MonoMac.ObjCRuntime.Selector ("openColorPanel")) 
    {
        return "openColorPanel";
    }
    if (sel == new MonoMac.ObjCRuntime.Selector ("openFontPanel")) 
    {
        return "openFontPanel";
    }
    if (sel == new MonoMac.ObjCRuntime.Selector ("Test")) 
    {
        return "Test";
    }
    return "openFontPanel";
}

static bool isSelectorExcludedFromWebScript(MonoMac.ObjCRuntime.Selector sel)
{
    Console.WriteLine("@@@@@@");
    if (sel == new MonoMac.ObjCRuntime.Selector("dataDidChange"))
    {
        return false;
    }
    if (sel == new MonoMac.ObjCRuntime.Selector ("instanceReady")) 
    {
        return false;
    }
    if (sel == new MonoMac.ObjCRuntime.Selector ("openColorPanel")) 
    {
        return true;
    }
    if (sel == new MonoMac.ObjCRuntime.Selector ("openFontPanel")) 
    {
        return false;
    }
    if (sel == new MonoMac.ObjCRuntime.Selector ("Test")) 
    {
        return false;
    }
    return true;
}

the two method haven't been Invoked in this environment ,never does the code as follows:

[Export("openColorPanel")]
public  void openColorPanel()
{
    Console.WriteLine ("aaa");
    NSColorPanel.SharedColorPanel.OrderFront (this);
}
[Export("openFontPanel")]
public  void openFontPanel()
{
    Console.WriteLine ("000");
    NSFontPanel.SharedFontPanel.OrderFront (this);
}

The downside is the JS code:

//
//  plugin.js
//  CKEditor4Cocoa
//
//  Created by Hermes Pique on 9/20/12.
//  Copyright (c) 2012 Robot Media. All rights reserved.
//

CKEDITOR.plugins.add('osxbuttons', {
    init: function(editor) {
        editor.addCommand('openColorPanel', {
            exec: function(editor) {
             Cocoa.openColorPanel();
            }
        });
        editor.ui.addButton('OSXTextColor', {
            label: 'Text Color',
            command: 'openColorPanel',
            className: 'cke_button_osxTextColor'
        });
        editor.addCommand('openFontPanel', {
            exec: function(editor) {
                Cocoa.openFontPanel();
            }
        });
        editor.ui.addButton('OSXFont', {
            label: 'Font',
            command: 'openFontPanel',
            className: 'cke_button_osxFont'
        });
    }
});