Can't access to ChartControl inside DrawingTool

[franjcy]

I'm trying to access to ChartControl inside a DrawingTool, but it's not found.

I want inside if (State == State.Terminated) to make something like this, when the DrawingTool is deleted:

ChartControl e = ChartPanel.ChartControl;

if (e != null)
{
e.Dispatcher.Invoke((Action)(() =>
{
Window chartWindow = Window.GetWindow(e.Parent);

quantitySelector = chartWindow.FindFirst("ChartTraderControlQuantityS elector") as QuantityUpDown;
if (quantitySelector != null)
{
quantitySelector.Value = 1;
}
}));
}

Output shows null pointer error. (Error on calling 'OnStateChange' method: System.NullReferenceException: Object reference not set to an instance of an object.)

[NinjaTrader_ChelseaB]

Hello franjcy,

You will need to use the chartControl property from the OnRender() method, which you could assign to a variable if you want to use this elsewhere in the script.
Be sure to check the variable is not null before using in other methods.

https://ninjatrader.com/support/helpGuides/nt8/onrender.htm

[franjcy]

Hello franjcy,

You will need to use the chartControl property from the OnRender() method, which you could assign to a variable if you want to use this elsewhere in the script.
Be sure to check the variable is not null before using in other methods.
https://ninjatrader.com/support/help...8/onrender.htm

Perfect, it works like a charm. I created a globlal script variable assigned inside OnRender and then used inside (State == State.Terminated) and it works fine.

[ClarissaGalloway]

Worked for me, too! Thanks for sharing it and saving me time in looking for a solution.