double click event

This event does exist but ís not browsable, so you don't see it in the WinForms designer as described here:
http://msdn.microsoft.com/de-de/library/system.windows.forms.button.doubleclick.aspx[^]
Here is a snippet to do it using code:

public Form1()
{
  InitializeComponent();
  button1.DoubleClick += new EventHandler(button1_DoubleClick);
}

void button1_DoubleClick(object sender, EventArgs e)
{
}

Additionally you need to derive your button class from:

class DoubleClickButton : Button
   {
      public DoubleClickButton()
         : base()
      {
         SetStyle(ControlStyles.StandardClick | ControlStyles.StandardDoubleClick, true);
      }
   }

Which sets the ControlStyles property to allow double clicks.