Last Updated: 18 Jun 2020 06:03 by ADMIN
Created by: Thomas Brown
Comments: 1
Category: Grid
Type: Bug Report

To reproduce the issue enable RowSelect and RowsDragDrop ClientSettings, and attach OnRowDropping  event listener

<ClientSettings AllowRowsDragDrop="true">
    <Selecting AllowRowSelect="true" />
    <ClientEvents OnRowDropping="function() {alert('RowDrooping event fired!');}"/>

Last Updated: 08 Apr 2020 15:07 by ADMIN

If using Frozen Columns with MultiHeaders, where one column has many headers while the other fewer. Each header in a column occupies some space and they get hidden, this will cause the upper (header) portion of the Grid to change its size. With that, the scrollbar will move away from the mouse position and causes the scrolling jump back and forth resulting in flickering.

Demo video of the issue: RadGrid FrozenColumns Flickering Header. The video can be found in the attachments as well.


Last Updated: 08 Apr 2020 14:07 by ADMIN
Created by: Mark
Comments: 2
Category: ComboBox
Type: Bug Report


Microsoft Edge 44.18362.449.0

Telerik Control:


Teleri Version:  Version=2017.3.913.45,


When a item is selected and a postback is occured, the SelectedValue returns an empty string.

Expected behavior:

The correct SelectedValue should be return.

Thing that have been tried so far:

1: upgrade the telerik to the latest version (2020.114) ---> issue persists

2: set autopostback to "true" problem solved

3: use other browsers (chrome, FireFox, new Version 79.0.309.68 ) issue disappears

Sample code: 

1: aspx

        onitemsrequested="ddlSupplier_ItemsRequested" autopostback="false">

2: code behind

protected void Page_Load(object sender, EventArgs e)
    protected void saveIssue_Click(object sender, EventArgs e)
    protected void ddlSupplier_ItemsRequested(object sender, Telerik.Web.UI.RadComboBoxItemsRequestedEventArgs e)
        RadComboBoxItem li = new RadComboBoxItem("Alan Jones (Brunel Systems Pty Ltd, test site)", "123");
         li = new RadComboBoxItem("Jackie Chiu (Optimum Construction, Optimum Construction (Sydney)) ", "23" );
         li = new RadComboBoxItem("Erik Baker (Optimum Construction, Optimum Construction (Sydney))", "2323");
    protected void b_Click(object sender, EventArgs e)
        var a = ddlSupplier.SelectedValue;  // most of the time returns "" for Edge





Last Updated: 05 Mar 2020 15:34 by ADMIN

I am using a component (GoogleMapControl) that inherit IExtenderControl . when i add it in to radajaxmanager updated controls or if i use it in dynamically loaded usercontrol by RadTab & RadMultiPage i am getting error of Unable to cast object of type 'GoogleMaps.Markers.GoogleMarkers' to type 'System.Web.UI.ExtenderControl'.

When i check the error detail by AsyncPostBackError event, i found that error comes from Telerik.Web.UI.ProxyScriptControl.GetChildScriptDescriptorsRecursive(Control parent, ArrayList scriptDescriptors).

Someones lived same problem old but same... As in

Last Updated: 20 Jan 2020 11:08 by ADMIN
Created by: Ruth
Comments: 1
Category: Button
Type: Bug Report
Just updated the controls and as usual got bitten by the change.  Very simple, we had a button that changed colors based on a change in an edit page.  The Button remained a White Color if nothing was entered, a Green Color if the fields were all correct and a Red Color if the fields were in error.  The determining factor is all behind the seen analysis on a save which has nothing to do with the Button.  Code behind the scenes sets a db value for the status of the Button. We know that the status is being set correctly because activity allowed or disallowed occurs correctly and that the DB settings having been checked are 100% correct as well.

There are seven Buttons with 7 Entry Pages that are affected and the users are totally confused when there is no visual direction as to the problem.

How do we Fix the Button to change Colors
Last Updated: 14 Jan 2020 07:35 by ADMIN

See online demo:


Steps to reproduce (seen in Chrome and Edge):

- Click the "x" on the 2nd to last record on page 1 to mark it for deletion  (Click "OK" at the prompt)

- Click "Add new record" button



 - the record marked for deletion moves up by one record (but fortunately it appears the correct record will actually get deleted upon Saving)

 - a blank new record is creating correctly


If you repeat this procedure but choose a different record for deletion you can see it is functioning correctly.


I am seeing the same behaviour in my own project.

Last Updated: 13 Jan 2020 12:30 by ADMIN

Hi all,


I saw an error File/Dir not found 404 on your demo as attached picture.


How to fixed error File/Dir not found 404 by drag and drop folder(s) after I clicked open it?

Last Updated: 02 Jan 2020 16:32 by ADMIN

We suspect a bug of Telerik controls:


Bug of Telerik: PageView.set_contentUrl(MyUrl) method - call MyUrl twice if RadTabStrip and RadMultiPage is inside RadAjaxPanel control. Firefox only.


It enter here two times:


If try it in chrome - request goes only one time.

If remove RadAjaxPanel - also request goes only one time.


Is it bug of your Controls?

Last Updated: 08 Oct 2019 08:13 by ADMIN
Created by: Vasssek
Comments: 1
Category: Input
Type: Bug Report


I have problem with typing into RadMaskedTextBox. I detected that problem is causing MaxLength property. In IE11, Chrome and Firefox, everything is working fine, but in Edge user couldn't type text into input.

<telerik:RadMaskedTextBox ID="txt_PFR1" runat="server" Width="110px" TabIndex="1" 
                                                    MaxLength="5" Mask="PFRaa">

Result text should be PFR and two characters, e.g. PFR12 or PFRaX, or... 

I suppose that this property is useless in this control instead of RadTextBox. Could you please remove it, if it doesn't have any other usage purpose ?




Last Updated: 04 Sep 2019 09:08 by ADMIN
Created by: Jacob
Comments: 1
Category: Grid
Type: Bug Report
The following steps create this issue:
1. Use html 4
2. Use telerik AJAX (For consistency)
3. Set a radgrid with some columns that reach beyond the extent of its element (such that it requires horizontal scrolling). Use at least four columns. One being the GridClientSelectColumn.
4. Have the following settings:
Control Settings: 

Control Events Used: NeedDataSource,OnItemDataBound
Client Settings:
EnablePostBackOnRowClick=false,Resizing AllowColumnResize=true, Selecting AllowRowSelect=true,UseClientSelectColumnOnly=false,Scrolling,AutoGenerateColumns=false,AllowScroll=true,UseStaticHeaders=true

Important note: Retain data on the server, rebind, and, on item databound, select the previously selected rows.

Set up a button to perform some action on the selected rows and have this action use AJAX such that this action depends on the currently selected rows in the RadGrid.

5. Scroll away from the selection checkboxes
6. Select some rows in your RadGrid
7. Perform your action with AJAX
If all was set up correctly, your grid should have been rebound with the previously selected rows re-selected. The RadGrid should still be scrolled to its previous position.
8. Perform your action with AJAX again. Here's the bug, the grid states that it has no selected items; however, the client shows that there are items selected in the UI.

This may be related to "RadGrid's last selected item index is not persisted correctly when two or more postbacks are triggered from external controls."
Last Updated: 04 Sep 2019 09:02 by ADMIN
Created by: Chavdar Dimitrov
Comments: 1
Category: UI for ASP.NET AJAX
Type: Bug Report

Last Updated: 06 Aug 2019 09:13 by ADMIN
Created by: JF
Comments: 2
Category: Spreadsheet
Type: Bug Report
I have two lines that was set to a certain height,

Each time I save the sheet, those two lines expand by 8 pixels.

Does anyone are reading those bug reports?
Last Updated: 28 Jun 2019 11:50 by ADMIN
Created by: product
Comments: 1
Category: Grid
Type: Bug Report
In GridTableView.cs, you provide a function
 protected virtual GridTableView CreateTableView() (Line 7828).
This function can be overloaded to return derived classes from GridTableView.

But, this is not overloadable completely. Because you create a GridTableView directly in protected void BuildDetailTablesFromDataSource() (Line 8808), too.
There you would have to call a virtual creator function, too.

This is necessary, because I have a lot of Trouble with your DataBind which I was able to fix with an overload. It is much to hard to make this bug visible for you, I really tried to do so already, but I had to fix this that way, because your GridTableView without my derivation fails in our szenario.

The call stack for that problem, I'd had to fix, is always like:
Exception of type 'System.Web.HttpUnhandledException' was thrown. ---> System.IndexOutOfRangeException: Cannot find column CheckSum.
                  at System.Data.DataTable.ParseSortString(String sortString)
                  at System.Data.DataView.set_Sort(String value)
                  at Telerik.Web.UI.GridEnumerableFromDataView.PerformTransformation()
                  at Telerik.Web.UI.GridEnumerableFromDataView.TransformEnumerable()
                  at Telerik.Web.UI.GridTableView.GetEnumerator(Boolean useDataSource, GridEnumerableBase resolvedDataSource, ArrayList dataKeysArray, Boolean shouldClearDataKeys)
                  at Telerik.Web.UI.GridTableView.CreateControlHierarchy(Boolean useDataSource)
                  at Telerik.Web.UI.GridTableView.CreateChildControls(IEnumerable dataSource, Boolean useDataSource)
                  at System.Web.UI.WebControls.CompositeDataBoundControl.PerformDataBinding(IEnumerable data)
                  at System.Web.UI.WebControls.DataBoundControl.OnDataSourceViewSelectCallback(IEnumerable data)
                  at Telerik.Web.UI.GridTableView.PerformSelect()
                  at Telerik.Web.UI.GridTableView.DataBind()
                  at Telerik.Web.UI.GridItemBuilder.BindDetailTable(GridDataItem parentItem, GridTableView cloned)
                  at Telerik.Web.UI.GridItemBuilder.BindDetailTables(GridDataItem parentItem, GridNestedViewItem detailItem)
                  at Telerik.Web.UI.GridItemBuilder.CreateItems(GridGroupingContext group)
                  at Telerik.Web.UI.GridTableView.CreateItems(IEnumerator enumerator, GridColumn[] columns, ControlCollection controls)
                  at Telerik.Web.UI.GridTableView.CreateControlHierarchy(Boolean useDataSource)
                  at Telerik.Web.UI.GridTableView.CreateChildControls(IEnumerable dataSource, Boolean useDataSource)
                  at System.Web.UI.WebControls.CompositeDataBoundControl.PerformDataBinding(IEnumerable data)
                  at System.Web.UI.WebControls.DataBoundControl.OnDataSourceViewSelectCallback(IEnumerable data)
                  at Telerik.Web.UI.GridTableView.PerformSelect()
                  at Telerik.Web.UI.GridTableView.DataBind()

In that, your DataTableView gets an invalid sort Expression string. Therefore, I overwrote DataBind.

But this is not possible in all cases, if you create GridViewTable() objects on your own.

Best regards
Last Updated: 26 Apr 2019 07:59 by ADMIN
Created by: Kaarthic
Comments: 1
Category: Grid
Type: Bug Report
I have added Listview in Header template in Template column, its showing the data on the grid as expected. When I am exporting to Excel or PDF its not exporting the header. Header you see in headertemplate.jpg is not exporting to PDF

Last Updated: 17 Apr 2019 15:54 by ADMIN
Created by: Vladimir
Comments: 1
Category: CloudUpload
Type: Bug Report
The RadCloudUpload doesn't handle correctly situation, when the communication between client and server becomes disconnected - the client side doesn't get notified (the upload keeps spinning).
All the details and steps to reproduced are in the following thread:
Last Updated: 16 Apr 2019 15:58 by ADMIN
I skipped the 3rd quarter 2016 update (2016.3.1027) for my copy of Telerik UI for ASP.NET.AJAX, since we were in code lock down at that time. 

 Later i installed the 4th quarter version (2016.4.1021.0)

Now, I still get a notice to install the previous version  (2016.3.1027) that I skipped.

That's annoying, and probably not possible. Right?

Is there anything we can do about this situation?

Thanks in advance
Tommy Heath
Last Updated: 16 Apr 2019 15:51 by ADMIN
Created by: Igor
Comments: 2
Category: TagCloud
Type: Bug Report
When Telerik CDN is enabled, the RadTagCloud control is not able to get (error 404)
href=" href="
Last Updated: 13 Apr 2019 08:35 by ADMIN
The RadTooltip and RadTooltipManager do not display tooltips like the default browser tooltips, if the tooltips are "nested".

Consider HTML like this

My name is <span class="app" title="Person Tooltip">MathyƟ<a class="noteLink criticalRight" id="RqoTeiLink_a" title="Der Notelink Tooltip"><sup>a</sup></a> Schwertzenbachen</span>, and I live somewhere. 

If you tooltipify this HTML then only the "outer" tooltip is displayed all the time. When using just the browser, then it displays correctly the "inner" tooltip when you hover over the link.

As the behaviour is not consitent with the browser (and other Tooltip libraries) this should be fixed.
Last Updated: 12 Apr 2019 16:50 by ADMIN
Created by: Wei Dong
Comments: 1
Category: Ajax
Type: Bug Report
Hi guy,

      I want use alert function in radajaxmanager,  After i  set  radajaxmanager.alert, if code is running it ,page will pop-up a window. but this window is not middle positon in current page.
How can i  solve this question.thanks.

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