Problem with delegates

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VB

Well i'll explain a bit for you to understand.

I'm creating a IDE, for this i've coded a class for each instance (i use an list for this instances, "List(of Custom_Class)"), on each instance there's a list with all the functions that can be used on this instance.
Now i fill this list trow a timer, so i use delegates to avoid the use of "CheckForIllegalCrossThreadCalls". Now i got a problem, this delegate that i use on the timer is not working. here is the code:

'delegate declaration
Delegate Function SelectedLine(ByVal tControl As Scintilla) As ScintillaNet.LinesCollection

'Timer.Tick event
Dim LinesDelegate As New SelectedLine(AddressOf GetLineCollection)

With Instances(If(TabControl1.InvokeRequired, SelectedTabIndexDel.Invoke(TabControl1), TabControl1.SelectedIndex))'this work perfect
If .SyntaxHandle.InvokeRequired Then
    If .SyntaxHandle.InvokeRequired Then
        Lines = LinesDelegate.Invoke(SyntaxHandle)'It's the same as calling the method with out the delegate (cross thread call)
    Else
        Lines = .SyntaxHandle.Lines
    End If
    For Each line As ScintillaNet.Line In Lines'Lines is like a null object when the invoke is required
        'if .invoke is used, then each "line" is a null object, other way it's not.
        'code
    Next
End With

'Delegate Function
Private Function GetLineCollection(ByVal tControl As Scintilla) As ScintillaNet.LinesCollection
    Return tControl.Lines'It's the same as calling the method with out the delegate (cross thread call)
End Function

Note: Instances is the List what contains all instances. SyntaxHandle is a control from Instance (my custom class) that hold the text.


If i omit something important to understand please let me know so i can add it.

Thanks in advance

Edit: updated code