[Solved] Recent version upgrade from 2025.4.1321 to 2026.3.812 issues

[RBarnes]

We recently upgrade from 2025.4.1321 to 2026.3.812 and now are seeing errors causing our pages to not load correctly.

This appears to happen with pages using RadTabStrip and MultiPage / PageViews where all pages are using a contenturl.

See image for more details.

 

[Vasko]

Hello Roger,

I hope you are doing well!

I tried replicating the issue but was not able to, could you share a code snippet demonstrating it or a runnable sample, so I can take a closer look at it and find a potential solution?

I am looking forward to your response.

Regards,
Vasko
Progress Telerik

[RBarnes]

Telerik dlls have been removed from the references directory.  But this is a very simple sample demonstrating the described behavior in the original post.

[Vasko]

Hi Roger,

Thank you for the provided project, I was able to reproduce the error and found its cause. Can you try the below override and let me know if it fixes the error on your end:

let $T = Telerik.Web.UI;

if ($T && $T.RadPageView) {
    $T.RadPageView.prototype.initialize = function () {
        this._renderWm(this.get_element());

        if (this.get_contentUrl() && this.get_element()) {
            let iframe = this.get_element().querySelector("iframe");
            iframe.title = `${this.get_contentUrl()} content`;
        }

        if (this.get_defaultButton()) {
            this._onKeyPressDelegate = Function.createDelegate(this, this._onKeyPress);
            $telerik.$(this._element).on('keypress', this._onKeyPressDelegate);
        }
    }
}

Regards,
Vasko
Progress Telerik

[RBarnes]

The script provided does appear to fix this on my end as well.  Thanks. I'll monitor releases for this correction before I proceed with my version upgrade.

 

 

[RBarnes]

Telerik dlls have been removed from the references directory.  But this is a very simple sample demonstrating the described behavior in the original post.