[vtkusers] loading a file

[Lam Ha]

Hi there

I am new to VTK and have just finished some coding. My application  
reads a .stl file and displays it. At the moment I have hardcoded the  
filename:

vtkSTLReader *sr = vtkSTLReader::New();
	sr->SetFileName("Ear.stl");

Now I would like to have a prompt-window (like the browse-button)  
from where I can choose my desired STL-file to be read. So in the end  
the last line from above would look like:

sr->SetFileName(filename);

What do I have to do?

Thanks in advance
Lam