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How to Fix this, Pass the Child window data to Textbox control within RadDock on parent page?

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This is a migrated thread and some comments may be shown as answers.
Vmax
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Vmax asked on 02 Apr 2017, 03:15 PM

Parent Code

01.<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Starter.aspx.cs" Inherits="WebWindows.Starter" %>
02. 
03.<%@ Register assembly="Telerik.Web.UI" namespace="Telerik.Web.UI" tagprefix="telerik" %>
04. 
05.<!DOCTYPE html>
06. 
08.<head runat="server">
09.    <title></title>
10. 
11.    <script type="text/javascript">
12.        function clientShow(sender, eventArgs)
13.        {
14.            var txtInput = document.getElementById("txtInput");
15.            sender.argument = txtInput.value;
16.        }
17.        function clientClose(sender, args)
18.        {
19.            if (args.get_argument() != null)
20.            {
21.                txtInput.value = args.get_argument();
22.            }
23.        }
24.</script>
25. 
26.     
27.</head>
28.<body>
29.    <form id="form1" runat="server">
30.        <telerik:RadScriptManager ID="RadScriptManager1" runat="server">
31.            <Scripts>
32.                <asp:ScriptReference Assembly="Telerik.Web.UI" Name="Telerik.Web.UI.Common.Core.js">
33.                </asp:ScriptReference>
34.                <asp:ScriptReference Assembly="Telerik.Web.UI" Name="Telerik.Web.UI.Common.jQuery.js">
35.                </asp:ScriptReference>
36.                <asp:ScriptReference Assembly="Telerik.Web.UI" Name="Telerik.Web.UI.Common.jQueryInclude.js">
37.                </asp:ScriptReference>
38.            </Scripts>
39.        </telerik:RadScriptManager>
40.        <telerik:RadAjaxManager ID="RadAjaxManager1" runat="server">
41.        </telerik:RadAjaxManager>
42.    <div>
43.     
44.                            <telerik:RadWindow ID="RadWindow1" runat="server" Height="600px" Modal="True" Width="800px" NavigateUrl="Childform.aspx" OnClientClose="clientClose" OnClientShow="clientShow" OpenerElementID="showDialog" ReloadOnShow="True">
45.                            </telerik:RadWindow>
46.        <br />
47.            <telerik:RadDockLayout ID="RadDockLayout1" Runat="server">
48.                <telerik:RadDockZone ID="RadDockZone1" Runat="server" Height="300px" Width="1220px">
49.                    <telerik:RadDock ID="RadDock10" Runat="server" Height="136px" Width="1182px">
50.                        <ContentTemplate>
51.                            <br />
52.                            <br />
53.                            <br />
54.                             
55.                          
56.                             
57.                        </ContentTemplate>
58.                    </telerik:RadDock>
59.                </telerik:RadDockZone>
60.        </telerik:RadDockLayout>
61. 
62.                            <asp:TextBox ID="txtInput" runat="server"></asp:TextBox>
63.                            <asp:Button ID="showDialog" runat="server" OnClientClick="clientShow" Text="Open" />
64.          
65.            <br />
66. 
67.    </div>
68.    </form>
69.</body>
70.</html>


Child page code :

01.<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="ChildForm.aspx.cs" Inherits="WebWindows.ChildForm" %>
02. 
03.<%@ Register assembly="Telerik.Web.UI" namespace="Telerik.Web.UI" tagprefix="telerik" %>
04. 
05.<!DOCTYPE html>
06. 
08.<head runat="server">
09.    <title></title>
10.  
11. <script type="text/javascript">
12.      
13.     function pageLoad() {
14.         
15.         txtInput = document.getElementById('txtUserInput');
16.         var currentWindow = GetRadWindow();
17.         txtInput.value = currentWindow.argument;
18. 
19.           
20.     }
21. 
22. 
23.     function GetRadWindow() {
24.         var oWindow = null;
25.         if (window.radWindow)
26.             oWindow = window.radWindow;
27.         else if (window.frameElement.radWindow)
28.             oWindow = window.frameElement.radWindow;
29.         return oWindow;
30.     }
31. 
32. 
33. 
34. 
35.     //Close the dialog and return the argument to the OnClientClose event handler
36.     function returnArg() {
37.          
38.         var oWnd = GetRadWindow();
39.         oWnd.close(txtInput.value);
40.     }
41. 
42.</script>      
43. 
44. 
45. 
46. 
47.</head>
48.<body>
49.    <form id="form1" runat="server">
50.    <div>
51.     
52.   
53. 
54.        
55.     
56.        <asp:ScriptManager ID="ScriptManager1" runat="server" OnLoad="Page_Load">
57.        </asp:ScriptManager>
58.       
59.        <asp:TextBox ID="txtUserInput" runat="server"></asp:TextBox>
60.        <br />
61.        <br />
62.        <asp:Button ID="Button1" runat="server" Text="Close With Argument" OnClientClick="returnArg(); return false;" />
63.        <br />
64. 
65.        
66.     
67.         
68. 
69. 
70. 
71.    </div>
72.    </form>
73.</body>
74.</html>


** The code working perfect if Textbox and Button outside RadDock Control, But inside doesn't work? 
Check attached video files.
Thanks

Vmax

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