UserControlCollection

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private System.Windows.Controls.Button myBuyButton;  
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private System.Windows.Controls.Button mySellButton;  
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private System.Windows.Controls.Grid   myGrid;  
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// Define a custom event method to handle our custom task when the button is clicked  
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private void OnMyButtonClick(object sender, RoutedEventArgs rea)  
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{  
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  System.Windows.Controls.Button button = sender as System.Windows.Controls.Button;  
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  if (button != null)  
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    Print(button.Name + " Clicked");  
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}  
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protected override void OnStateChange()  
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{  
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  if (State == State.SetDefaults)  
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  {  
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    Name         = "SampleAddButton";  
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    Description   = "Adds a custom control to the chart";  
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    IsOverlay     = true;  
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  }  
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  else if (State == State.Configure)  
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  {  
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  }  
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  // Once the NinjaScript object has reached State.Historical, our custom control can now be added to the chart  
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  else if (State == State.Historical)  
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  {  
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    // Because we're dealing with UI elements, we need to use the Dispatcher which created the object  
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    // otherwise we will run into threading errors...  
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    // e.g, "Error on calling 'OnStateChange' method: You are accessing an object which resides on another thread."  
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    // Furthermore, we will do this operation Asynchronously to avoid conflicts with internal NT operations  
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    ChartControl.Dispatcher.InvokeAsync((() =>  
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    {  
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        // Grid already exists  
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        if (UserControlCollection.Contains(myGrid))  
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          return;  
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        // Add a control grid which will host our custom buttons  
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        myGrid = new System.Windows.Controls.Grid  
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        {  
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          Name = "MyCustomGrid",  
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          // Align the control to the top right corner of the chart  
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          HorizontalAlignment = HorizontalAlignment.Right,  
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          VerticalAlignment = VerticalAlignment.Top,  
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        };  
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        // Define the two columns in the grid, one for each button  
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        System.Windows.Controls.ColumnDefinition column1 = new System.Windows.Controls.ColumnDefinition();  
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        System.Windows.Controls.ColumnDefinition column2 = new System.Windows.Controls.ColumnDefinition();  
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        // Add the columns to the Grid  
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        myGrid.ColumnDefinitions.Add(column1);  
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        myGrid.ColumnDefinitions.Add(column2);  
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        // Define the custom Buy Button control object  
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        myBuyButton = new System.Windows.Controls.Button  
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        {  
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          Name = "MyBuyButton",  
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          Content = "LONG",  
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          Foreground = Brushes.White,  
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          Background = Brushes.Green  
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        };  
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        // Define the custom Sell Button control object  
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        mySellButton = new System.Windows.Controls.Button  
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        {  
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          Name = "MySellButton",  
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          Content = "SHORT",  
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          Foreground = Brushes.White,  
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          Background = Brushes.Red  
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        };  
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        // Subscribe to each buttons click event to execute the logic we defined in OnMyButtonClick()  
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        myBuyButton.Click += OnMyButtonClick;  
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        mySellButton.Click += OnMyButtonClick;  
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        // Define where the buttons should appear in the grid  
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        System.Windows.Controls.Grid.SetColumn(myBuyButton, 0);  
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        System.Windows.Controls.Grid.SetColumn(mySellButton, 1);  
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        // Add the buttons as children to the custom grid  
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        myGrid.Children.Add(myBuyButton);  
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        myGrid.Children.Add(mySellButton);  
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        // Finally, add the completed grid to the custom NinjaTrader UserControlCollection  
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        UserControlCollection.Add(myGrid);  
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    }));  
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  }  
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  // When NinjaScript object is removed, make sure to unsubscribe to button click events  
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  else if (State == State.Terminated)  
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  {  
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    if (ChartControl == null)  
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        return;  
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    // Again, we need to use a Dispatcher to interact with the UI elements  
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    ChartControl.Dispatcher.InvokeAsync((() =>  
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    {  
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        if (myGrid != null)  
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        {  
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          if (myBuyButton != null)  
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          {  
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              myGrid.Children.Remove(myBuyButton);  
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              myBuyButton.Click -= OnMyButtonClick;  
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              myBuyButton = null;  
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          }  
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          if (mySellButton != null)  
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          {  
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              myGrid.Children.Remove(mySellButton);  
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              mySellButton.Click -= OnMyButtonClick;  
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              mySellButton = null;  
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          }  
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        }  
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    }));  
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  }  
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}