Installer Plugin that pops a message box to the user

messagebox.m

//
//  MyInstallerPane.m
//  messagebox
//
//  Created by Chris Ross on 1/23/18.
//  Copyright © 2018 testplugin. All rights reserved.
//

/*
This should be in MyInstallerPane.h
#import <InstallerPlugins/InstallerPlugins.h>

@interface MyInstallerPane : InstallerPane

@end
*/

#import "MyInstallerPane.h"
#import <Foundation/Foundation.h>

@implementation MyInstallerPane

- (NSString *)title
{
    return [[NSBundle bundleForClass:[self class]] localizedStringForKey:@"PaneTitle" value:nil table:nil];
}

- (void)didEnterPane:(InstallerSectionDirection)dir
{
    //Malicious logic when entering pane
    NSAlert *alert = [[NSAlert alloc] init];
    [alert setMessageText:@"Are you sure you want to install my malware?"];
    [alert setInformativeText:@"Remember, you WANTED this...."];
    [alert addButtonWithTitle:@"OK"];
    [alert addButtonWithTitle:@"Cancel"];
    [alert setAlertStyle:NSInformationalAlertStyle];
    
    NSInteger result = [alert runModal];
    if (result == NSAlertFirstButtonReturn) {
        NSLog(@"first button clicked");
    } else if (result == NSAlertSecondButtonReturn) {
        NSLog(@"Second button clicked");
    }
}

- (void) willEnterPane:(InstallerSectionDirection)dir {
    //Malicious logic when ????
}

- (BOOL)shouldExitPane:(InstallerSectionDirection)dir
{
    return YES;
}


@end

Hello @xorrior , I am working on an Installer Plugin that opens the browser with a pre specified URL, I am unable to get help on this since I am new to macOS and Installer Plugins, can you help me with it, the problem I am dealing with is that I have the functions in C++/ObjC but I am unable to call them, Please help