Release History

Telerik® UI for Blazor 15.0.0 (2026 Q3)

August 12, 2026

Common

NEW

• Chain Of Thought component
• Tool Call component
• Checkpoint component
• Citation component
• Reasoning component
• Compatibility with .NET 11 Preview 7
• Add new trial banners

Breaking Changes

• Unsafe template syntax for dataviz components is removed, use JS functions instead. This affects components like Chart, StockChart, Map, Diagram, Gauges, etc.

Dependencies

• Supports Bootstrap theme version 14.5.0
• Supports Classic theme version 14.5.0
• Supports Default theme version 14.5.0
• Supports Fluent theme version 14.5.0
• Supports Material theme version 14.5.0
• Supports Meridian theme version 14.5.0

Diagram

NEW

• Allow rich text content for shapes and connections

DropDownList

FIXED

• FieldIdentifier is set only on initialization

Examples

FIXED

• Normalize ThemeConfigurator theme path handling

ExpansionPanel

FIXED

• Prevent page scroll when toggling with space key)

FileManager

FIXED

• SelectedItemsChanged is triggered when ListView is active

FileSelect

NEW

• Improve file read performance

Grid

FIXED

• Unlocking a column from the column menu does not work
• Add k-sortable class to the header cell if the column is sortable
• Virtual scrolling does not work with no data template
• SearchBox may skip typed characters randomly

PivotGrid

FIXED

• Horizontontal scrolling resets vertical scrollbar

Popup

FIXED

• OnHide does not fire on outside click after programmatic Hide

PromptBox

FIXED

• Recalculate auto-mode textarea height after multiline state update on paste
• OnPromptAction does not fire after runtime Mode change

Scheduler

NEW

• Add confirmation dialog when removing recurrence
• Add popover opening upon more events button click to preview the events before changing the view
• New adaptive appointment rendering
• Redesign and change layout of the editing form and recurrence editor
• Add readonly state for the appointments
• New enhanced 'more events' button rendering
• Replace compact view tool native select with telerik dropdown menu button
• New compact mode for tools and adaptive toolbar behavior
• Add 'add new event' tool

FIXED

• Agenda view exception on runtime grouping removal
• Render correctly empty time span and midnight events
• Use invariant CSS numeric formatting for Timeline culture regression

TabStrip

FIXED

• Pinned tabs should be first when set in onstateinit
• Overflow menu button should be initially enabled when tabs are overflowing and is rendered inside template

Taskboard

FIXED

• Prevent TaskBoard rendering failure caused by missing localization service

TreeView

FIXED

• OnItemContextMenu fires for all parent items