Hello Michal,

I'm reopening the thread to suggest a potential solution. While waiting for the issue to be resolved, you can try hiding and showing the Grid as a temporary workaround. This may cause the Grid to flicker when toggling the columns' visibility, but I hope it can help until an official fix is available for the problem.

@if (GridVisible)
{
    <TelerikGrid Data="@GridData">
        <GridColumns>
            <GridCheckboxColumn Locked="true" 
                                Visible="@ColumnVisible">
            </GridCheckboxColumn>
            <GridColumn  Field="@(nameof(Product.Id))" Locked="true">
                <Template Context="ctx">
                Template
                </Template>
            </GridColumn>
            <GridColumn Field="@(nameof(Product.Name))" Title="Product Name" />
        </GridColumns>
    </TelerikGrid>
}

@code {
    bool GridVisible { get; set; } = true;

    async Task ToggleCheckboxColumnVisibility()
    {
        GridVisible = false;
        await Task.Delay(1);
        ColumnVisible = !ColumnVisible;

        GridVisible = true;
    }

Here is a REPL example: https://blazorrepl.telerik.com/mxOSlnaC27516pRP00

Regards,
Yanislav
Progress Telerik

Hello Michal,

I have reached out to the development team to talk about the matter with them, indeed the behavior is a problem originating from our side. Since it is a regression, we will fix it with the highest priority, so we expect to have it fixed as soon as possible.
We apologize for any inconvenience caused until the issue is resolved.

I have also updated your Telerik points as a token of gratitude for helping us identify this issue.

Regards,
Yanislav
Progress Telerik

Hi Michal,

I am stepping into the discussion to provide further assistance while my colleague, Yanislav, is out of office.

I tested the configuration you shared and I reproduced the issue you are referring to. While the behavior is indeed different in the new version, I noticed that the buttons are declared inside a GridColumn. In the general case, this type of column is used for data binding and such action buttons may be declared inside a GridCommandColumn.

I have modified your example to add similar command buttons in a command column and I am not reproducing the problem with such a configuration. Here is the modified version: https://blazorrepl.telerik.com/GxuykTlH56RxNTdA55

That said, can you please share some more details on the exact scenario and why it is needed to use action buttons in a data bindable GridColumn instead of using CommandButton instances inside a CommandColumn?

Thank you in advance! I look forward to hearing from you.

Regards,
Nadezhda Tacheva
Progress Telerik

Hello Michal,

Thank you for bringing the issue to our attention! I'm sorry to hear that you encountered a problem when updating to 4.1.0.

I've created a REPL example in which I've tried to reproduce the problem. - https://blazorrepl.telerik.com/mHunGjbO44l9kQcQ55.

After conducting an investigation, I was not able to replicate the behavior you reported. In order to identify the root cause of this behavior and resolve it, we need to reproduce the issue locally. This will allow us to better understand the problem and troubleshoot it effectively.

That being said, may I ask you to modify the REPL example I've linked above so the issue is reproducible and send it back to us? 

We appreciate your cooperation in this matter, and we look forward to hearing back from you.

Regards,
Yanislav
Progress Telerik