# vtkRenderWindow only works in Load Event
**URL:** https://discourse.vtk.org/t/vtkrenderwindow-only-works-in-load-event/4003
**Category:** Support
**Created:** [August 17, 2020, 11:33pm UTC](https://discourse.vtk.org/t/vtkrenderwindow-only-works-in-load-event/4003 "2020-08-17T23:33:42Z")
**Posts on this page:** 5
**Page:** 1
### Author:  [@JimHewitt](https://discourse.vtk.org/u/JimHewitt)
#### Post date: [August 17, 2020, 11:33pm UTC](https://discourse.vtk.org/t/vtkrenderwindow-only-works-in-load-event/4003/1 "2020-08-17T23:33:42Z")
I’m trying the [ReadPLY](https://lorensen.github.io/VTKExamples/site/CSharp/IO/ReadPLY/) example and it works. However, when I move the call to `Readply()` from `renderWindowControl1_Load1` to a a button click event, it doesn’t work. Is there a way I can do this in the button click event?
---
### Author:  [@toddy](https://discourse.vtk.org/u/toddy)
#### Post date: [August 18, 2020, 12:12am UTC](https://discourse.vtk.org/t/vtkrenderwindow-only-works-in-load-event/4003/2 "2020-08-18T00:12:59Z")
The vtkRenderer is not available until the window control has loaded, so you need to disable your button until you can obtain a reference to it (in the load event). Then after adding the actor, in the click event `renderWindowControl1.Invalidate()`
---
### Author:  [@JimHewitt](https://discourse.vtk.org/u/JimHewitt)
#### Post date: [August 18, 2020, 2:27am UTC](https://discourse.vtk.org/t/vtkrenderwindow-only-works-in-load-event/4003/3 "2020-08-18T02:27:04Z")
@Todd - This is what I have, but it still doesn’t work. I wasn’t able to attach the ply file, but
you can find it [here](https://www.cs.colostate.edu/~cs410/yr2015fa/Models/Medium/airplane.txt)
`
public partial class Form1 : Form
{
private vtkRenderWindow renderWindow;
private vtkRenderer renderer;
```
public Form1()
{
InitializeComponent();
}
private void renderWindowControl1_Load(object sender, EventArgs e)
{
try
{
button1.Enabled = false;
renderWindow = renderWindowControl1.RenderWindow;
renderer = renderWindow.GetRenderers().GetFirstRenderer();
//ReadPLY();
button1.Enabled = true;
}
catch (Exception)
{
throw;
}
}
private void ReadPLY()
{
string filePath = @"C:\temp\airplane.ply";
vtkPLYReader reader = vtkPLYReader.New();
reader.SetFileName(filePath);
reader.Update();
vtkPolyDataMapper mapper = vtkPolyDataMapper.New();
mapper.SetInputConnection(reader.GetOutputPort());
vtkActor actor = vtkActor.New();
actor.SetMapper(mapper);
renderer.AddActor(actor);
}
private void button1_Click(object sender, EventArgs e)
{
try
{
ReadPLY();
renderWindowControl1.Invalidate();
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}
}
```
`
---
### Author:  [@toddy](https://discourse.vtk.org/u/toddy)
#### Post date: [August 18, 2020, 4:01am UTC](https://discourse.vtk.org/t/vtkrenderwindow-only-works-in-load-event/4003/4 "2020-08-18T04:01:30Z")
I assume when you say “it doesn’t work” you mean it doesn’t display? Please be more specific.
in the button click event try
`renderer.ResetCamera();`
`renderWindowControl1.Invalidate();`
---
### Author:  [@JimHewitt](https://discourse.vtk.org/u/JimHewitt)
#### Post date: [August 18, 2020, 4:11am UTC](https://discourse.vtk.org/t/vtkrenderwindow-only-works-in-load-event/4003/5 "2020-08-18T04:11:07Z")
Sorry, yes, it didn’t display anything. I added `renderer.ResetCamera()` and now it does display, so thank you!