2 Qs: TreeView, Transparent Blitting

I have 2 questions:

One:
In a TreeView control, there doesn't seem to be an 'ItemDblClick' event.
There is an 'ItemClick' event and a 'DblClick' event, but how do I find out if a user double clicked on an item? I tried combining ItemClick and DblClick with no success

Two:
Is there a way to blit with a specified transparent color?

If possible, please supply code.
Thanks.

[Serge]

Here is a little example:

Private m_nodSelected As Node

Private Sub Form_Load()
    Dim i As Integer
    Dim j As Integer
    Dim nodParent As Node
    
    With TreeView1
        For i = 1 To 5
            Set nodParent = .Nodes.Add(, , "Parent" & i, "Parent" & i)
            For j = 1 To 10
                .Nodes.Add nodParent, tvwChild, "Child" & i & j, "Child" & i & j
            Next
        Next
    End With
End Sub


Private Sub TreeView1_DblClick()
    If m_nodSelected Is Nothing Then
        MsgBox "Nothing is selected."
    Else
        MsgBox m_nodSelected.Text
    End If
End Sub

Private Sub TreeView1_MouseDown(Button As Integer, Shift As Integer, x As Single, y As Single)
    Set m_nodSelected = TreeView1.HitTest(x, y)
End Sub

Thanks Serge

Does anybody know the answer to the second question?