Public Class Form1
    Public Class MyRadioButton
        Inherits Windows.Forms.RadioButton
 
        Declare Function GetDoubleClickTime Lib "user32" () As Integer
 
        Private dblClickTime As Integer = GetDoubleClickTime
        Private LastClickTime As DateTime
        Private ts As New TimeSpan
 
        Public Event DblClick(ByVal sender As MyRadioButton)
 
 
        Protected Overrides Sub OnClick(ByVal e As System.EventArgs)
            MyBase.OnClick(e)
 
            ts = DateTime.Now.Subtract(LastClickTime)
 
            If ts.TotalMilliseconds() - LastClickTime.Millisecond < _
              dblClickTime Then
                RaiseEvent DblClick(Me)
            End If
 
            LastClickTime = DateTime.Now
        End Sub
    End Class
 
    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As _
      System.EventArgs) Handles MyBase.Load
 
    End Sub
 
 
    Private Sub RadioButton1_CheckedChanged(ByVal sender As System.Object, _
      ByVal e As System.EventArgs) Handles RadioButton1.CheckedChanged
 
    End Sub
End Class

c++ umsteiger .... so viel fragen^^