DoubleClick and MouseDown

I had the same problem. I've found a good example for DragDrop, but you can use it for any purposes:

" The idea is to wait with starting the DoDragDrop event until the doubleclick event should have fired, if that hasn't fired, then do it. The code, in case other people run into the same problem:

Class variable
Private IsWaitingForDoubleClick As Boolean

Set during load (Add a timer first)
Timer1.Interval = SystemInformation.DoubleClickTime

Private Sub DocList_MouseMove(ByVal sender As System.Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles DocList.MouseMove
    If Not e.Button = MouseButtons.Left Then Return
    StartWaitForDoubleClick()
End Sub
Private Sub DocList_MouseUp(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles DocList.MouseUp
    EndWaitForDoubleclick()
End Sub

Private Sub StartWaitForDoubleClick()
    'This remains true until the timer fires, or the mouse button is released
    IsWaitingForDoubleClick = True
    Timer1.Enabled = True
End Sub
Private Sub EndWaitForDoubleclick()
    IsWaitingForDoubleClick = False
End Sub

Private Sub Timer1_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Timer1.Tick
    If IsWaitingForDoubleClick Then
        IsWaitingForDoubleClick = False
        StartDragDrop()
    End If
    sender.Enabled = False
End Sub

Private Sub StartDragDrop()
    DocList.DoDragDrop(DocList.SelectedItems(0),DragDropEffects.Copy)
End Sub

This way the mouseClick and mouseDoubleClick events will fire as normally, and you can put any code you like into there."