Custom Workflow Activity not showing in Plugin Registration

Question

Could anybody suggest what I am doing wrong here?
I have created a Custom Workflow Activity using this sample
Create a custom workflow activity. But this is not showing up as a plugin/activity type in Plugin Registration Tool. See image below:
My sample code for the activity below:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Activities;
using Microsoft.Xrm.Sdk;
using Microsoft.Xrm.Sdk.Workflow;
namespace TestCustomWorkflowActivity2
public class SampleCustomActivity : CodeActivity
protected override void Execute(CodeActivityContext executionContext)
//Create the tracing service
ITracingService tracingService = executionContext.GetExtension<ITracingService>();
//Create the context
IWorkflowContext context = executionContext.GetExtension<IWorkflowContext>();
IOrganizationServiceFactory serviceFactory = executionContext.GetExtension<IOrganizationServiceFactory>();
IOrganizationService service = serviceFactory.CreateOrganizationService(context.UserId);
Platform
Dynamics CRM 2013 On Premises v 6.1.2.112 (SP1 UR2 installed)
Dynamics CRM 2015 Online
.NET Framework version
4.0
Thanks and Regards,
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Answer 1

Hi,
I can see only one difference with my code:
I placed using detectives in namespace:
namespace Crm_RTB_NewAcc.Workflow
using System;
using System.Activities;
using System.ServiceModel;
using Microsoft.Xrm.Sdk;
using Microsoft.Xrm.Sdk.Workflow;
using Microsoft.Xrm.Sdk.Query;
public sealed class GetOrgLicense : CodeActivity
// Define Inputs/Outputs
[Output("Count")]
public OutArgument<int> Count { get; set; }
protected override void Execute(CodeActivityContext executionContext)
//My code here
Count.Set(executionContext, 5);
Try to make same code. It working well. 
Hi xjomanx,
I just tried your suggestion, but still the class is not appearing in the plugin registration. Btw, could you please confirm what version of PluginRegistration you are using?
blog: <a href="http://technologynotesforyou.wordpress.com">http://technologynotesforyou.wordpress.com</a> | skype: ali.net.pk