error fibonacci circle "is not an object "

[bicou]

I try to draw a fibonacci circle by code but i have the error ... I"s not an object"
I found the code here : https://ninjatrader.com/support/help...accicircle.htm

FibonacciCircle myFibCirc = Draw.FibonacciCircle(this, "tag1", true, 10, Low[10], 0, High[0]);

This code is in a function that executes when the chart is clicked.
Can you explain me how to draw it correctly
Thank you

[NinjaTrader_Jesse]

Hello bicou,

Can you provide an image of the error that you are seeing?

The code you provided/from the help guide compiles fine on my end so I am not sure what specific error you are seeing based on the details.

[bicou]

The exact error is : Unhandled exception: Object reference not set to an instance of an object.
The code :

protected void MouseClicked(object sender, MouseButtonEventArgs e)
{
  FibonacciCircle myFibCirc= Draw.FibonacciCircle(this, "tag1", true, 10, Low[10], 0, High[0]);
}​

thx

[NinjaTrader_Jesse]

Hello bicou,

That means an object was null.

If you use button or mouse events you also need to use TriggerCustomEvent inside the event handler.

https://ninjatrader.com/support/help...tsub=TriggerCustomEvent

private void MymouseHandler()
{
TriggerCustomEvent(o =>
{
// your code here
}, null));​

[bicou]

Thank you, it works very well.
I have one more question.
Here I only trace one object so with a boolean, as you can see in my code, I can manage its deletion.

if ( Drawn)
{
RemoveDrawObject("tag1");
Drawn = false;
}
else
{
myFibCirc= Draw.FibonacciCircle(this, "tag1", true, 10, Low[10], 0, High[0]);
Drawn = true;
}​​

But if I have several objects, how can I delete one of them?
I thought of testing the tag with if (myFibCirc.Tag == "tag1")... but it doesn't work and I haven't found anything like it in the documentation.
Thanks

[NinjaTrader_Jesse]

Hello bicou,

If you have several objects they would need to have unique tag names so you would just need to specify the unique tag that you wanted to remove. If you wanted to control when that gets removed you would have to make a second variable and conditions similar to what you have shown to control that second object.

[bicou]

Thank you for your answer