I regret to say that my experience with Telerik UI for WinForms has been extremely disappointing. I purchased this product expecting high-quality controls and performance for my applications, but it has failed to meet even basic expectations.

Key Issues:

1. Severe Performance Problems:
   The application built with Telerik UI for WinForms suffers from severe slowness, especially when working with large datasets or complex controls like grids. Virtualization and optimization options provided by Telerik are either ineffective or insufficient for real-world use cases.

2. Poor User Experience:
   The slow responsiveness of Telerik controls has led to constant client complaints. This directly impacts my business as my clients are frustrated with the application's usability.

3. No Solutions from Telerik:
   Despite searching extensively in forums and documentation, there are no practical solutions to the performance issues. Even technical support responses lack clarity and effectiveness.

4. Waste of Money:
   Considering the price of the Telerik license, the performance and value provided are far below expectations. My clients are losing faith in my software, and I am unable to justify renewing or continuing with Telerik products.

Conclusion:

I strongly advise others to reconsider investing in Telerik UI for WinForms if performance and user experience are critical for your applications. The cost does not match the value provided. I will not be renewing my license and am exploring alternative UI frameworks like DevExpress or Syncfusion.

I want to create a class of RadGroupBox that when I drop my class on a form, that there is no "TEXT" value.  We use the GroupBox alot in our system, /w out the HEADER TEXT.  So far, my attempts have failed.   Here is my GroupBy class.

   public sealed class NtsRadGroupBoxNoHeader : RadGroupBox
   {
      #region Public Constructors

      public NtsRadGroupBoxNoHeader()
      {
         Padding = new System.Windows.Forms.Padding(2);
         ThemeClassName = "Telerik.WinControls.UI.RadGroupBox";
         Text = string.Empty;
         AccessibleName = string.Empty;
         AccessibleDescription = string.Empty;
         ((Telerik.WinControls.Primitives.TextPrimitive)(GetChildAt(0).GetChildAt(1).GetChildAt(2).GetChildAt(1))).Text = string.Empty;
      }

      #endregion Public Constructors
   }

Hi Telerik supportteam,

I’ve found something interesting around filtering combined with a CustomGroupComparer on a RadGridView. To illustrate the situation I added a small example application.

Situation:

Start the application, create a groupBy on e.g. TwoStateCheckbox column, expand some of the groups.

Now, filter on e.g. Name (contains ‘7’).

Result:

All the groups get collapsed.

My own analyses:

With a breakpoint on rule 21 in the CustomGroupComparer, I see that dataGroup.IsExpanded is false, even when the group in the grid is expanded.

With a custom group comparer, Telerik does something with a groupBuilder. It suggests that groups are cloned? If that’s the case I guess the IsExpanded property is not set correctly. Sounds like a bug to me. Can you confirm this and how can I work around this??

By the way: without a customGroupComparer it works ok but we need the custom thing.

Regard,

Daniel Kaya

Hi,

I have just installed the latest update to R3 2022 and notice that the rendering of radio buttons now seems to have an issue when drawn in HDPI.

I have taken these images from the Demo App for Group Box

Example in non HDPI

When application dragged to HDPI 4K monitor

Kind regards, Toby

hi

Why do I want to uncheck all the form checkboxes, but the regular checkbox is done ?!

my code is

Greetings,

In order to apply fade-in effect to rad controls (if possible), a nice approach is to increase the opacity of RootElement from 0 to 1 gradually with a timer. It works just fine with most of the rad controls including radbuttons, but there is an issue when I apply this method to a rad group box.

I attached a gif file that illustrates the issue (please notice that the blue background is actually the background of radgroupbox itself, not the container form).

Changing opacity of Radgroupbox.RootElement only affects the border frame of the box, not the whole box itself (background color stays still even with RootElement.Opacity = 0 ).

Any suggestion to fade in a radgroupbox ?

Thanks in advance.

Hello,

Some of my groupbox have no header text. I've found out a little spot in place of header in Office2007 theme even there is no header text.

In order to figure out by myself, I've compared most of telerik themes. Please see what I've found in the attach picture.

How can I hide the little spot (or the little blank in some theme)?

Is this normal? Any idea? 

Thank you by advance.

Hello,

I have defined my own GroupBox, that inherits the RadGroupBox.

If I apply a Theme, nothing happend.

Button, MaskedEditBox, CheckBox etc. works fine, but not the GroupBox.

Is this an known issue?

Regards