Questions on UI for ASP.NET AJAX Forum

1 answer

51 views

RadWindow incorrectly calculates its size when containing a RadAjaxPanel

Hello Telerik Support,

we recently upgraded our application from Telerik UI for ASP.NET AJAX 2025 Q2 to Telerik UI for ASP.NET AJAX 2026 Q2.

Since the upgrade, we have encountered an issue with the RadWindow control when it contains a RadAjaxPanel.

The height and width of the RadWindow are calculated incorrectly. As a result, the content inside the RadWindow is either cut off or the window is significantly larger or smaller than expected.

We were able to reproduce the same behavior in the official Telerik demo:

https://demos.telerik.com/aspnet-ajax/window/examples/autosize/defaultcs.aspx

We have attached a screenshot showing the incorrect behavior in the Telerik demo.

Steps to reproduce

Open the Telerik RadWindow AutoSize demo.
Use a RadAjaxPanel inside the RadWindow.
Compare the behavior between Telerik UI for ASP.NET AJAX 2025 Q2 and 2026 Q2.
With 2025 Q2, the window size is calculated correctly.
With 2026 Q2, the height and/or width is calculated incorrectly.

Expected behavior

The RadWindow should automatically calculate its size based on the actual dimensions of the content inside the window, including the content of the RadAjaxPanel.

Actual behavior

With Telerik UI for ASP.NET AJAX 2026 Q2, the RadWindow calculates an incorrect height and width when a RadAjaxPanel is present.

Could you please let us know:

Is this a known issue in 2026 Q2?
Was there a change in the RadWindow or RadAjaxPanel auto-sizing behavior between 2025 Q2 and 2026 Q2?
Is there a recommended workaround or configuration we can use?
Will this issue be fixed in an upcoming release?

Since the issue can also be reproduced in the official Telerik demo, we assume that this is related to a change in the Telerik controls rather than our application.

Thank you for your help.

Best regards

Ajax

Window

answered on 28 Aug 2026

2 answers

51 views

[Solved] RadGrid auto reload many time with chrome, but firefox and safari doesn't

Starting from July, any page containing a radgrid in the system experiences an automatic continuous reload error that cannot be stopped and adds a suffix like ? ctl75_ctl03_gvResultsChangePage=1, at the same time, Chrome encounters an error, while Firefox and Safari do not. When restarting IIS, the system stops having errors, but a few days later, the errors reoccur. Below is an example of a page with an error.


        <telerik:RadGrid ID="gvResults" runat="server" AutoGenerateColumns="False" AllowPaging="True" AllowSorting="True" Skin="Windows7" GridLines="None" AllowMultiRowSelection="True">
            <PagerStyle Mode="NextPrevAndNumeric" PagerTextFormat="Change page: {4} {5} văn bản / {1} trang" PageSizeLabelText="Số văn bản" EnableSEOPaging="False" />
            <MasterTableView ClientDataKeyNames="Id" AllowMultiColumnSorting="True" NoMasterRecordsText="Không tìm thấy dữ liệu.">
                <Columns>
                    <telerik:GridBoundColumn HeaderText="Số ký hiệu" DataField="Notation" HeaderStyle-Width="120px">
                    </telerik:GridBoundColumn>
                    <telerik:GridBoundColumn HeaderText="Ngày ký" DataField="CreatedDate" HeaderStyle-Width="70px" DataFormatString="{0:dd/MM/yyyy}">
                    </telerik:GridBoundColumn>                
                </Columns>
            </MasterTableView>
            <ClientSettings EnableRowHoverStyle="true">
                <Selecting AllowRowSelect="True" />
                <ClientEvents OnCommand="gvResults_Command" />
            </ClientSettings>
        </telerik:RadGrid>

General Discussions

Grid

answered on 27 Aug 2026

2 answers

48 views

Lost in ZIP Extensions

Hi,

I am kinda lost in the big ZIPLibrary forest.

Ik downloaded NuGet Zip. Extension, but not recognized as Telerik.Windows.Zip.Extensions, only as Telerik.Zip.Extensions.

Also the commands are not recognized, see screenshot.

I must re-factor some old code, can you give some pointers?

Marc

Installer and VS Extensions

answered on 27 Aug 2026

10 answers

1.8K+ views

[Solved] Column misalignment with Static Headers and Scrolling

Hello,

I've encountered a puzzling issue with the RadGrid when using static headers and scrolling. Initially, when there is no scrolling necessary, the grid renders as expected (see image 1).

However, once I add a new record that causes scrolling to occur, the grid expands horizontally, causing a horizontal scrollbar in the window, and the grid rows are no longer aligned with their headers (see image 2).

Oddly enough, the grid realigns itself when I move the cursor over one of the drop-down template items (see image 3).

Here is my grid definition:

<telerik:RadGrid ID="dtgUses" runat="server" AllowSorting="true" AllowMultiRowEdit="true"

AllowFilteringByColumn="true" PageSize="5" AutoGenerateColumns="false" ShowFooter="true"

EnableHeaderContextMenu="true" Width="96%" EnableHeaderContextFilterMenu="true"

OnPreRender="dtgUses_PreRender" OnNeedDataSource="dtgUses_NeedDataSource" OnItemDataBound="dtgUses_ItemDataBound"

OnItemCommand="dtgUses_ItemCommand" AllowCustomPaging="true">

<ClientSettings AllowGroupExpandCollapse="true">

<Scrolling AllowScroll="true" ScrollHeight="125px" UseStaticHeaders="true" />

</ClientSettings>

<PagerStyle Mode="NextPrevAndNumeric" />

<MasterTableView DataKeyNames="Id" GroupLoadMode="Server" AllowNaturalSort="true"

ShowGroupFooter="true" ItemStyle-Wrap="false" CommandItemDisplay="Top" CommandItemSettings-ShowRefreshButton="False"

EditMode="InPlace" IsFilterItemExpanded="false" FooterStyle-Wrap="false" TableLayout="Fixed">

<Columns>

<telerik:GridTemplateColumn UniqueName="Use" HeaderText="Occupancy" HeaderButtonType="TextButton"

HeaderStyle-HorizontalAlign="Left" HeaderStyle-Width="125px" SortExpression="UseCodeDescr">

<ItemTemplate>

<%# Eval("UseCodeDescr")%>

</ItemTemplate>

<EditItemTemplate>

<telerik:RadComboBox runat="server" ID="cbUseCode" DataTextField="Descr" DataValueField="Id"

Width="100%" />

</EditItemTemplate>

</telerik:GridTemplateColumn>

<telerik:GridTemplateColumn UniqueName="Quality" HeaderText="Grade" HeaderButtonType="TextButton"

HeaderStyle-HorizontalAlign="Left" HeaderStyle-Width="70px" SortExpression="QualityShortDescr">

<ItemTemplate>

<%# Eval("QualityShortDescr")%>

</ItemTemplate>

<EditItemTemplate>

<telerik:RadComboBox runat="server" ID="cbQuality" DataTextField="Descr" DataValueField="Id"

Width="100%" />

</EditItemTemplate>

</telerik:GridTemplateColumn>

<telerik:GridTemplateColumn UniqueName="Condition" HeaderText="Cond" HeaderButtonType="TextButton"

HeaderStyle-HorizontalAlign="Left" HeaderStyle-Width="70px" SortExpression="ConditionShortDescr">

<ItemTemplate>

<%# Eval("ConditionShortDescr")%>

</ItemTemplate>

<EditItemTemplate>

<telerik:RadComboBox runat="server" ID="cbCondition" DataTextField="Descr" DataValueField="Id"

Width="100%" />

</EditItemTemplate>

</telerik:GridTemplateColumn>

<telerik:GridBoundColumn DataField="EffectiveYearBuilt" HeaderButtonType="TextButton"

HeaderStyle-HorizontalAlign="Right" HeaderText="Eff. Year" HeaderStyle-Width="50px"

SortExpression="EffectiveYearBuilt" UniqueName="EffectiveYearBuilt" DataType="System.Int16">

</telerik:GridBoundColumn>

<telerik:GridBoundColumn DataField="YearRemodeled" HeaderButtonType="TextButton"

HeaderStyle-HorizontalAlign="Right" HeaderText="Remodel Year" HeaderStyle-Width="75px"

SortExpression="YearRemodeled" UniqueName="YearRemodeled" DataType="System.Int16"

FooterText="Total Area:" FooterStyle-HorizontalAlign="Right">

</telerik:GridBoundColumn>

<telerik:GridBoundColumn DataField="ActualArea" HeaderButtonType="TextButton" ItemStyle-HorizontalAlign="Right"

HeaderStyle-HorizontalAlign="Right" HeaderText="Actual Area" HeaderStyle-Width="50px"

ReadOnly="true" SortExpression="ActualArea" UniqueName="ActualArea" Aggregate="Sum"

FooterAggregateFormatString="{0:G}" DataType="System.Decimal" FooterStyle-HorizontalAlign="Right">

</telerik:GridBoundColumn>

<telerik:GridBoundColumn DataField="Percent" HeaderButtonType="TextButton" DataType="System.Decimal"

HeaderStyle-HorizontalAlign="Right" HeaderStyle-Width="50px" ItemStyle-HorizontalAlign="Right"

HeaderText="% of Section" SortExpression="Percent" UniqueName="PercentOfSection"

DataFormatString="{0:P}" ReadOnly="true">

</telerik:GridBoundColumn>

<telerik:GridButtonColumn UniqueName="Delete" CommandName="Delete" ButtonType="ImageButton"

HeaderStyle-Width="20px" ImageUrl="~/skins/GovernBlue/Telerik/Grid/Delete.gif"

ConfirmText="Are you sure you want to delete this use?" ItemStyle-HorizontalAlign="Center"

ShowInEditForm="true" />

</Columns>

</MasterTableView>

</telerik:RadGrid>

What I'd really like is for the grid to maintain its alignment at all times (see image 4). The grid works just fine without static headers, but I need to keep the static headers because that is part of the requirement. I've spent hours researching these forums and tried countless solutions that have been suggested in other threads to no avail. Is there something I'm missing here? Thanks!

Grid

answered on 26 Aug 2026

1 answer

47 views

ClientDeleteColumn and Static Client ID

Hello,

I have a page which opens from a master page in RadWindow. Inside it I have RadGrid with ClientDeleteColumn.
When I set ClientIDMode=“Static” of RadGrid, OnGridCreated client event stops firing and clicking ClientDeleteColumn returns JavaScript error “Cannot read properties of null (reading ‘_clientDelete’) but the codebehind delete method executes. If I remove ClientIDMode=“Static” everything looks fine, OnGridCreated fires, clicking ClientDeleteColumn gets no errors but the codebehind delete method doesn’t execute (no log entries and after reloading the page the “deleted” row returns). What could be the problem and how to solve it? Thanks!

Grid

Window

answered on 10 Aug 2026

1 answer

77 views

changed PublicKeyToken for Telerik.Licensing?

Have you suddenly changed the PublicKeyToken for this?

Primary reference "Telerik.Licensing.Runtime, Version=1.8.2.0, Culture=neutral, PublicKeyToken=98bb5b04e55c09ef".

Primary reference "Telerik.Licensing.Runtime, Version=1.9.0.0, Culture=neutral, PublicKeyToken=5f520923a76c27d3".

Licensing

answered on 07 Aug 2026

1 answer

44 views

RadComboBox OnClientSelectedIndexChanged not firing

I have a set of 7 radcombobox controls on a page. When any one of them has their selected index changed I want the value of that combobox to "fill" to the right via a javascript function.

The combobox definitions are:

And the Bridge_Fill function is defined as:

Cases 1, 2, 3, 4, and 5 are essentially the same as Case 0 with one less combobox. The code is a little sloppy but that's not the problem.

When I change the first combobox, everything works and the other 6 comboboxes change their value correctly. It also works the second time. On the third time though the OnClientSelectedIndexChanged event does not fire and I cannot determine why. Any ideas?

ComboBox

answered on 28 Jul 2026

1 answer

45 views

radmenu\Radsitemap Border showing on select or click.

I recently upgrade to 2026.2.708 from 2025.1.416

After upgrading there is a border appearing when I click on the menu item/radsitemap. How do I remove the border? Attached screenshot shows the border appearing. The border is either dark blue or red depending on if I select or just right click the item, otherwise the border is not currently showing.

my current css.

.RadSiteMap .rsmLevel > .rsmItem .rsmLink {
color: #1c4259 !important;
font-size: 12px !important;
}

#GDIV > .RadSiteMap .rsmLevel > .rsmItem .rsmLink:hover,
.RadSiteMap .rsmLevel > .rsmItem .rsmLink:hover {
color: #b31d3d !important;
font-size: 12px !important;

}

#GDIV > .RadSiteMap .rsmLevel > .rsmItem .rsmLink {
color: #1c4259 !important;
font-size: 11px !important;
line-height: 12px !important;

}

#GDIV > .RadSiteMap .rsmLevel > .rsmItem .rsmLink:hover {
color: #be1d3d !important;
font-size: 11px !important;
line-height: 12px !important;

}

.RadMenu.RadMenu_Context.higherMenu {
z-index: 2147483647 !important;
}

.RadMenu_Default .rmRootGroup .rmFocused > .rmLink {
border-color: transparent !important;
box-shadow: none !important;
}

Thanks,

Menu

SiteMap

answered on 27 Jul 2026

1 answer

290 views

JS errors in RadHtmlChart

I have a page with multiple RadHtmlCharts onit which generates following errors:

[Violation] Permissions policy violation: unload is not allowed in this document.

Sys.UI.DomEvent.addHandler@
(anoniem)@
(anoniem)@
 
Do you have any idea what could cause this?
I guess this is blocking other Javascripts on the page.

Chart (HTML5)

answered on 22 Jul 2026

1 answer

44 views

Unable to Download UI for ASP.NET AJAX Trial Installer

Hi,

I'm trying to download the UI for ASP.NET AJAX trial installer.

When I click Download Free Trial, I'm redirected to a request form instead of receiving a download link. I submitted the request, but I haven't received any response or email with the installer.

Could you please let me know:

Is there any other way to obtain the trial installer?
How long does it typically take to receive the download link after submitting the request?
Is there a direct download page available?

Any guidance would be appreciated.

Thank you!

Window

answered on 17 Jul 2026

	Sys.UI.DomEvent.addHandler	@
	(anoniem)	@
	(anoniem)	@