The Window will not open in the center of the screen if it was already opened once and the page has been scrolled. It seems that the Window keeps opening at the same position initially was opened, hence it could open out of screen bounds.

Steps & Code for Reproduction

1. Copy/Paste the Code from below and Load the page
2. Click on the Button, the Window will open at the center
3. Scroll toward the top of the page until the button is barely visible
4. Click the button again. At this point, the Window will open out of the screen boundaries, in its initial position

Code

<style>
    .mydiv {
        margin: 2000px 100px;
    }
</style>

<telerik:RadWindow ID="RadWindow1" runat="server">
    <ContentTemplate>
        <h3>RadWindow1 Content</h3>
    </ContentTemplate>
</telerik:RadWindow>

<script>
    function ShowEditForm(sender, args) {
        var wnd = $find("<%= RadWindow1.ClientID %>");
        wnd.show();
    }
    Sys.Application.add_load(function () {
        setTimeout(function () {
            $telerik.$('.mydiv')[0].scrollIntoView();
        }, 100)
    });  
</script>

<div class="mydiv">
    <telerik:RadButton runat="server" ID="RadButton1" Text="OpenWindow" AutoPostBack="false" OnClientClicked="ShowEditForm" />
</div>

This issue seems fixed for AzureAD while it is not for WSFederation authentication

• https://github.com/AzureAD/azure-activedirectory-identitymodel-extensions-for-dotnet/issues/495

It seems the final solution is to manually remove the entries with null/empty key from the submitted form

The RadWindow width and height are not persisted when the control has been minimized before a PostBack (or navigation to another page).

Steps to reproduce:

1. Run the code below.
2. Click the "Open" Button
3. Minimize RadWindow
5. Click the "PostBack" button
6. Maximize RadWindow

Result: The restored RadWindow has wrong size

        <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>

Steps to reproduce: 

1) Start dragging a RadWindow;

2) While dragging, use the mouse scroll to scroll the page

Result: The cursor will not be on the title bar anymore.

When I set RadWindow property VisibleTitlebar="false" then top border is missing on window.
Here is sample code:
<telerik:RadWindow runat="server" ID="GenerateReportWaitWindow" Width="440px" Height="200px" 
                    VisibleTitlebar="false" Modal="true" ReloadOnShow="false" VisibleStatusbar="false" 
                    VisibleOnPageLoad="false" EnableShadow="false" Animation="Fade" Behaviors="None"
                    Title="Čakajte prosím...">
                    <ContentTemplate>
                        <div style="min-height: 66%;">
                            <div style="padding-top: 30px; padding-bottom: 45px; text-align: center; font-weight: bold;">
                                <asp:Label ID="Label4" runat="server">Prebieha vytváranie tlačovej zostavy. Čakajte prosím.</asp:Label>
                              
                                <asp:Label ID="Label5" runat="server">(V závislosti od počtu záznamov to môže trvať aj niekoľko minút...)</asp:Label>
                                <asp:Label ID="Label6" runat="server" ForeColor="Red" Style="display: none;"></asp:Label>
                          
                            </div>
                            <div style="margin-left: auto; margin-right: auto; text-align: center;">
                                <asp:Image ID="Image2" runat="server" ImageUrl="~/Images/Animated/loading1.gif" />
                            </div>
                        </div>
                    </ContentTemplate>
                </telerik:RadWindow>

Admin comment:
Actually there is 1px top border, but it is hard to be noticed. As a temporary solution, one can increase it via the following padding:

Copy Code
<style>
    .RadWindow {
        padding: 4px 5px 5px !important;
    }
</style>

When I try to close the RadWindow on mobile (Chrome Mobile, Chrome Mobile desktop emulator) by clicking on the default Close button (aka X button), if I have a clickable element behind the X button, this one also grabs the input and triggers the OnClick event of the behind element.

The problem can be reproduced in the following demo http://demos.telerik.com/aspnet-ajax/window/examples/radopen/defaultcs.aspx.

Workaround:
<script>   
        function OnClientShow(sender, args) {
            $telerik.$(".rwCloseButton").bind("touchstart", function (e) {
                $telerik.cancelRawEvent(e);
            });
       }
</script>
<telerik:RadWindow OnClientBeforeShow="OnClientShow" RenderMode="Lightweight" ID="RadWindow1" runat="server" ShowContentDuringLoad="false" Width="400px"
                Height="400px" Title="Telerik RadWindow" Behaviors="Default">
</telerik:RadWindow>

I have a radwindow which opens as a modal popup when a button is clicked, in the initial stages the rad window was able to be dragged towards right and bottom, of the screen, even out of the screen bounds, i managed to fix that by setting the KeepInScreenBounds="true" RestrictionZoneID="dvContainerMain", where "dvContainerMain" is the main div within which all the parent controls come
but now when i resize the parent browser window to almost size less than radwindow size, rad window seems to behave weird, am not able to resize the radwindow even if the resize behavior  is set
Please let me know on this issue, 
seems like there is a bug when the RestrictionZoneID width is less than or close to the radwindow size 

Thanks
Tony Thomas