End node in wpf flowchart

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WPF

Hi,

I am using Microsoft Visual Studio 2010.I have created workflowdesigner in VS 2010.Recently it it migrated to VS 2012.

My problem is I am not able to display or add an end step/activity to the flowchart.
By default start node is getting visible and I can add steps to the start node etc is possible.

I have tried with the below code.But failed.
private void AddDesigner()
{
//Create an instance of WorkflowDesigner class.
this.wd = new WorkflowDesigner();

//Place the designer canvas in the middle column of the grid.
Grid.SetColumn(this.wd.View, 1);

Flowchart flow = new Flowchart();
flow.DisplayName = "Designable Flowchart";

//add the end step to the flow chart by default
FlowStep endStep = new FlowStep();
endStep.Action = new End(); // <---- this is the custom activity (End())
flow.Nodes.Add(endStep);

ActivityBuilder mRootActivityBuilder = new ActivityBuilder();
mRootActivityBuilder.Implementation = flow;

wd.Load(mRootActivityBuilder);

//Add the designer canvas to the grid.
grid1.Children.Add(this.wd.View);
}


But can any one please help me to add/create end step also.

Thanks in advance.