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Call back event failed


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I have this code, which I wanted to enable the scroll bar on checked of a check box. But when I checked the check box, I get prompted for this error: refer to attached. Saying the target 'Charts' for callback could not be found.

Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load

Charts.Gallery = Gallery.Bar

Charts.UseCallbacksForEvents =



Charts.BackColor = System.Drawing.Color.LightGray

Charts.Background =

NothingCharts.PlotAreaColor = System.Drawing.ColorTranslator.FromHtml("#FFFFCC")

Charts.LegendBox.Dock = DockArea.Top

Charts.RenderFormat =

".Net"AddHandler Charts.UserCallback, AddressOf ChartFX_UserCallback


"OnClick", "Feed1(" & Application("waitingSeconds") & ")")




Protected Sub ChartFX_UserCallback(ByVal sender As Object, ByVal e As ChartFX.WebForms.UserCallbackEventArgs)

If e.Param = "1" Then

sender.AxisX.AutoScroll =


sender.AxisX.PixelsPerUnit = 17

sender.AxisX.ScrollPosition = sender.AxisX.ScrollSize


sender.AxisX.AutoScroll =


End If

End Sub


Javascript code:

function Feed1(waitingseconds)


document.getElementById("chkEnableScrollbar").disabled = true;if (document.getElementById("chkEnableScrollbar").checked == false)


scrollchecked = 0;

milisecond = 10;




scrollchecked = 1;

milisecond = waitingseconds;



setTimeout('Callback_Relay(' + scrollchecked + ')', milisecond);


function Callback_Relay(intScrollchecked)




"chkEnableScrollbar").disabled = false;



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 hmmm. Im going to try run your code. meanwhile, you can check the last post of this thread. I posted a sample application in C# that shows how to to this and it working well. So, you can by the moment you can check it out while i get your code. http://community.softwarefx.com/forums/p/10500/25656.aspx#25656

 Also, can you please post the aspx page code you define to declare the chart?


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This is how I declare the chart:

Dim Charts As New ChartFX.WebForms.Chart

Actually, I got this problem solved. I forget to assign the "Charts.ID = Charts".

But now, another problem arise. When I click on the checkbox, nothing happen. No error message prompted whatsoever. Just nothing happen.


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you can open Internet explorer -> Tools -> Options

-> Security [Trusted Sites] and configure ActiveX controls and plugins so

they can have enough access and permissions.


You can also use caspol to set permissions like this:

open a visual studio command prompt or navigate (with CD command) :

cd C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727

you can also set Full trust to all in the internet zone.

caspol -machine -chggroup Internet_Zone FullTrust


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