Breaking Changes in 14.0.0

Updated on May 29, 2026

Chart

The template syntax with literals and inline expressions is deprecated. Instead, set the Template parameter to the name of a JavaScript function that returns the required content. This change is also related to CSP compliance.

Using Chart templates up to version 13.3.0 and after version 14.0.0

UI for Blazor 13.3.0	UI for Blazor 14.0.0
RAZOR <ChartValueAxisLabels Template="#= value #" />	RAZOR <ChartValueAxisLabels Template="chartLabelTemplate" /> <script> function chartLabelTemplate(context) { return context.value; } </script>

Chat

The OnLoadMoreMessages event arguments now contain the full rendered message range, not just the newly requested page.

Menu

The MenuHideEvent.Click value of the Menu's HideOn parameter now also causes the child items popup to close, when the user clicks or taps a leaf Menu item.

PDFViewer

• The PDF.js library used internally by the PDFViewer is updated to version 5.x. If you are using different products that depend on PDF.js, make sure they depend on the same version.
• The ZoomChanged callback type changed from EventCallback<decimal> to EventCallback<object>. Update existing handlers to accept object. Casting the argument with (decimal)newZoom is safe after the initial render.

TabStrip

The ActiveTabIndexChanged event and the ActiveTabIndex parameter are now removed. Use the ActiveTabId parameter with the ActiveTabIdChanged event instead.

ThemeColor Changes

The appearance of the components listed below is determined by the active theme style sheet.

ThemeColor Values

The following values of the ThemeColor parameter are removed from the following components:

Component	Removed ThemeColor values
AppBar	Dark, Error, Info, Light, Success, Warning
Avatar, Loader, LoaderContainer	Dark, Error, Info, Inverse, Light, Success, Warning
Badge	Dark, Inverse, Light
Button, DropDownButton, FontIcon, Notification, SvgIcon, SplitButton	Dark, Light

ThemeColor Parameter

The ThemeColor parameter is removed from:

• Card. See how to use the Class parameter to apply theme colors to Cards.
• Dialog
• Window
• Popup edit settings

OverlayThemeColor Parameter

OverlayThemeColor is removed from the LoaderContainer.

See Also

• Rendering changes in Telerik UI for Blazor 14.0.0