title: MouseWheel event doesn't fire when using any control with scrolbars (in C# Windows Forms)
body: <p>MouseWheel event doesn't fire 
  when I' am using any control (ListBox, Panel, TextBox) with scrollbars.</p>
  
  <p>To reproduce problem:</p>
  
  <pre><code>public class Form1 : Form
   {
    private readonly Button button1;
    private readonly TextBox textBox1;
  
    private void button1_MouseWheel(object sender, MouseEventArgs e)
    {
     ToString(); // doesn't fire when uncomment lines below
    }
  
    public Form1()
    {
     button1 = new Button();
     textBox1 = new TextBox();
     SuspendLayout();
  
     button1.Location = new System.Drawing.Point(80, 105);
     button1.Size = new System.Drawing.Size(75, 23);
     button1.MouseWheel += button1_MouseWheel;
     button1.Click += button1_Click;
  
     textBox1.Location = new System.Drawing.Point(338, 105);
     //textBox1.Multiline = true; // uncomment this
     //textBox1.ScrollBars = ScrollBars.Vertical;  // uncomment this 
     textBox1.Size = new System.Drawing.Size(100, 92);
  
     ClientSize = new System.Drawing.Size(604, 257);
     Controls.Add(textBox1);
     Controls.Add(button1);
     ResumeLayout(false);
     PerformLayout();
    }
  
    // Clicking the button sets Focus, but even I do it explicit Focus() or Select()
    // still doesn't work
    private void button1_Click(object sender, System.EventArgs e)
    {
     button1.Focus();
     button1.Select();
    }
   }
  </code></pre>