[VB] updating charts

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I know this is an "vba" forum, but i got great help here earlier, and I hope you can help me with this vb question as well.

I am trying to change data points in a serie in a chart on a userform. The effect i am looking for is the same you have in Windows taskmanager (the CPU perfomance charts).

This is how far i am. It is a simple test to get the hang of it.

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Pnt1 = 2
        Chart1.Series.Item("A").Points(0).SetValueXY(0, Pnt1)
        Chart1.Update()
    End Sub

Problem is that the point(0) which currently contains 0,0 isnt set to 0,2. And the chart isnt updated.

So the question is any idea on how to do this, or where i can find an answer?

 

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Right, so first this:

The "Yvalues" is an array. It took me some searching to figure out why it won't simply work if you use:

Chart1.Series.Item("A").Points(0).YValue() = 2

You need to specify which item within the array you want to change so:

Chart1.Series.Item("A").Points(0).YValue(0) = 2

Will work.
I changed to code into this:

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Chart1.Series.Item("A").Points(0).YValues(0) = 2
        Chart1.Update()
    End Sub

Now the Yvalue changes into 2 but the chart doesnt show any change... If I use that technique with the xValue it will change... Any thoughts??