.NET 2010 Chart control scrolling issue

G'day Guys,

I have an issue with the auto scrolling of the chart control my code displays the speed of a machine over a set period of time. This starts by expanding the X axis out to represent the timespan which is in the settings, at this point the graph moves along deleting the first point and adding a new point.
The problem is that when the time span is up it seems to be added the point but not displaying it and at the same time deleting the oldest data but the graph isn't scrolling along. This worked fine till I changed the Datatimeintervaltype to minutes and the chartvaluetype to time. Below is an image of what it is currently looking like after it reaches the set time period

Attachment 30705

The Code relating to this is as follows:

Code:

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      If Me.Histograph_time_in_mins <= 20 Then


            With Chart1.ChartAreas("ChartArea1")


                .AxisX.IntervalType = DataVisualization.Charting.DateTimeIntervalType.Minutes
                .AxisX.LabelStyle.Interval = 1
                .AxisX.LabelStyle.Format = "mm:ss"
            End With



        ElseIf 120 <= Me.Histograph_time_in_mins Then

            With Chart1.ChartAreas("ChartArea1")


                .AxisX.IntervalType = DataVisualization.Charting.DateTimeIntervalType.Minutes
                .AxisX.LabelStyle.Interval = 15
                .AxisX.LabelStyle.Format = "hh:mm"
            End With

        ElseIf 3600 < Me.Histograph_time_in_mins Then

            With Chart1.ChartAreas("ChartArea1")

                .AxisX.IntervalType = DataVisualization.Charting.DateTimeIntervalType.Minutes
                .AxisX.LabelStyle.Interval = 30
                .AxisX.LabelStyle.Format = "hh:mm"
            End With

        ElseIf 21600 < Me.Histograph_time_in_mins Then

            With Chart1.ChartAreas("ChartArea1")


                .AxisX.IntervalType = DataVisualization.Charting.DateTimeIntervalType.Hours
                .AxisX.LabelStyle.Interval = 1
                .AxisX.LabelStyle.Format = "hh"
            End With

        ElseIf 43200 > Me.Histograph_time_in_mins Then

            With Chart1.ChartAreas("ChartArea1")


                .AxisX.IntervalType = DataVisualization.Charting.DateTimeIntervalType.Hours
                .AxisX.LabelStyle.Interval = 6
                .AxisX.LabelStyle.Format = "hh"
            End With




        End If


        scroll_enable_counter = scroll_enable_counter + 1



        If scroll_enable_counter > FormatNumber((Me.Histograph_time_in_mins * 60) / (Timer1.Interval / 1000), 0) Then

            Chart1.Series("Line_Speed").Points.RemoveAt(0)
            Chart1.Series("Required_speed").Points.RemoveAt(0)

        End If

        TextBox12.Text = FormatNumber((Me.Histograph_time_in_mins * 60) / (Timer1.Interval / 1000), 0)
        TextBox11.Text = Chart1.Series("Line_Speed").Points.Count
        Chart1.ChartAreas("ChartArea1").AxisX.ScrollBar.Enabled = True

        Chart1.Series("Line_Speed").Points.AddXY(DateTime.Now, TextBox1.Text)
        Chart1.Series("Required_speed").Points.AddXY(DateTime.Now, TextBox2.Text)
    End Sub

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If anyone can suggest away around this problem that would be great. I want to use the

Code:

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DateTimeIntervalType

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as this allows for the labels to sit on the minutes, hour, day etc..

Cheers,

Robbo99