<telerik:RadButton ID="Btn1" runat="server" Text="Open" AutoPostBack="false" OnClientClicked="openFirst"></telerik:RadButton>
        <br />
        <telerik:RadButton runat="server" ID="RadButton1" Text="Postback" AutoPostBack="true" />

        <telerik:RadWindowManager ID="RadWindowManager1" runat="server" EnableViewState="false" PreserveClientState="true">
            <Windows>
                <telerik:RadWindow ID="radWindow_Evidence" runat="server" Title="Evidence" EnableViewState="false" AutoSize="false" DestroyOnClose="true" ReloadOnShow="true"
                    VisibleTitlebar="true" VisibleStatusbar="false" Width="900px" Height="500px"
                    Behaviors="Close,Minimize,Move,Resize,Maximize" Left="320px" Top="0px">
                    <ContentTemplate>
                        Some content
                    </ContentTemplate>
                </telerik:RadWindow>
            </Windows>
        </telerik:RadWindowManager>

        <script>
            function openFirst() {
                radopen(null, "radWindow_Evidence");
            }
        </script>

private void RadWizard1_NextButtonClick(object sender, WizardEventArgs e)
{
    if (Page.IsValid)
    {
        int activeStepIndex = RadWizard1.ActiveStep.Index;
        var wizstep = RadWizard1.WizardSteps[activeStepIndex];
        wizstep.Enabled = true;

        for (var index = 0; index < wizstep.Controls.Count; index++)
        {
            var ctrl = wizstep.Controls.Item[index] as WebControl;
            if (ctrl != null)
                ctrl.Enabled = true;
        }
    }
}

Private Sub RadWizard1_NextButtonClick(sender As Object, e As WizardEventArgs) Handles RadWizard1.NextButtonClick
    If Page.IsValid Then
        Dim activeStepIndex As Integer = TryCast(sender, RadWizard).ActiveStep.Index
        Dim wizstep = RadWizard1.WizardSteps.Item(activeStepIndex)
        wizstep.Enabled = True

        For index = 0 To wizstep.Controls.Count - 1
            Dim ctrl = TryCast(wizstep.Controls.Item(index), WebControl)
            If ctrl IsNot Nothing Then
                ctrl.Enabled = True
            End If
        Next
    End If
End Sub

<telerik:RadCodeBlock runat="server">
    <script>
        function pageLoadHandler() {
            var scheduler = $find("<%= RadScheduler1.ClientID %>");
            var $scheduler = $telerik.$(scheduler.get_element());
            var viewType = "Day";
            if (scheduler.get_selectedView() == Telerik.Web.UI.SchedulerViewType.WeekView) {
                viewType = "Week";
            } else if (scheduler.get_selectedView() == Telerik.Web.UI.SchedulerViewType.MonthView) {
                viewType = "Month";
            }

            $scheduler.find(".rsPrevDay").attr("title", "Previous " + viewType)
            $scheduler.find(".rsNextDay").attr("title", "Next " + viewType)

            // Sys.Application.remove_load(pageLoadHandler);  
        }
        Sys.Application.add_load(pageLoadHandler);
    </script>
</telerik:RadCodeBlock>

<script>
    function pageLoadHandler() {
        $telerik.$(".RadInput").attr("role", "presentation")
        // Sys.Application.remove_load(pageLoadHandler);  
    }
    Sys.Application.add_load(pageLoadHandler);
</script>

var WebARIAHelper = (function ($) {

  // Assign default ARIA roles to desired elements
  function AssignDefaultARIARoles(element) {
    element = (element || document.body);

    // TFS 110547 - Mark SPAN/DIV around RadInput elements as presentation to avoid confusing JAWS form field dialog
    $("span.RadInput, div.RadInput", element).attr("role", "presentation");
  }
  
  // Handle AJAX EndRequest event to process any new content
  function WebARIAHelperEndRequestHandler(sender, args) {
    if (args.get_error() == null) {
      // Make sure all page controls can finish their ready event processes before looking at DOM
      window.setTimeout(function () {
        AssignDefaultARIARoles();
      }, 10);
    }
  }
         
  $(function () {
    // Make sure all page controls can finish their ready event processes before looking at DOM
    window.setTimeout(function () {
      AssignDefaultARIARoles();
    }, 10);

    if (window.Sys && Sys.WebForms && Sys.WebForms.PageRequestManager) {
      var instance = Sys.WebForms.PageRequestManager.getInstance();
      if (instance) instance.add_endRequest(WebARIAHelperEndRequestHandler);
    }
  });


  return null;
}
)($ || $telerik.$);