title: why OpenFileDialog1->ShowDialog don't work?
body: <p>I am working for a interface in Visual Studio 2012 VC++ Windows forms. I use <code>OpenFileDialog</code>, but i don't understand why <code>ShowDialog</code> doesn't work. </p>
  
  <p>I added the <code>openFileDialog1</code> in my interface.
  then in the code, i just write </p>
  
  <pre><code>private: System::Void Ouvrir_Click(System::Object^  sender, System::EventArgs^  e)
  {
      openFileDialog1-&gt;ShowDialog();
  }
  </code></pre>
  
  <p>The dialog box did not appear and my interface is blocked also...</p>