# 2026 v1

## Content

## Chart

**Bug Fixes**

* [.NET] Fixed an issue where FlexPie data labels did not render correctly.

## Core

**Bug Fixes**

* [.NET] Fixed an issue where the `TypographyExtensions` caused header text to freeze after applying the **MaterialDark** theme.
* [.NET] Fixed issue where icons did not display in the `Icon Sets` drop-down of the Segments section in `RulesManager`.
* [.NET] Fixed an issue where the core value access function threw a `System.Reflection.AmbiguousMatchException` during property resolution when the target type defined multiple default properties.
* [.NET Framework] Fixed an issue where C++/CLI applications using C1 WinForms controls displayed the `ComponentOne License Not Found` dialog despite a valid <span data-highlighted="true" data-vc="highlighted-text">SA3</span> license.

## FlexChart

**Bug Fixes**

* [.NET Framework] Fixed an issue where running the AnimationDemo and DrillDown samples triggered a `System.Reflection.TargetInvocationException`.
* [.NET Framework] Fixed an issue where dragging FlexPie or Sunburst controls onto a form after installing the `C1.``<span data-highlighted="true" data-vc="highlighted-text">Xaml</span>``.``<span data-highlighted="true" data-vc="highlighted-text">WPF</span>``.FlexChart` NuGet package triggered a `System.NullReferenceException`.

## FlexDiagram

**Bug Fixes**

* [.NET] Fixed an issue where setting `FlexDiagram.ItemsSource` to a string caused a `System.NullReferenceException`.

## FlexGrid.Filter

**Bug Fixes**

* [.NET] Fixed an issue where the **Select All** checkbox in the column filter did not display the indeterminate state when a theme was applied.

## FlexReport

**Improvements**

* Added **Radar Chart** field support.

## GanttView

**Bug Fixes**

* [.NET] Fixed an issue where setting all tier visibility values to `false` with `AutomationProperties.Enabled=True` caused a `System.NullReferenceException`.

## Gauge

**Bug Fixes**

* [.NET] Fixed an issue where the default gauge pointer color changed from previous builds.
* [.NET] Fixed an issue where the `OnValueChanged` and `ValueChanged` events did not trigger when values were updated.
* [.NET] Fixed an issue where values greater than 87 returned `NaN` when `IsReversed` was enabled.
* [.NET] Fixed an issue where out-of-range `StartAngle` and `SweepAngle` values caused rendering to freeze.
* [.NET] Fixed an issue where mark decorators overlapped because of collisions in the marks implementation.
* [.NET] Improved gauge decorator styling consistency by moving `BorderBrush`, `BorderWidth`, and `BorderDashes` properties to the base `GaugeDecorators` class.

## Grid

**Breaking Changes**

* [.NET] Removed `AutomationEnabledProperty`. `AutomationEnabled` is now implemented as a CLI property.
* [.NET] Updated the `CanDragRow` and `CanDragColumn` method signatures in `GridCellFactory` to accept four parameters.

I**mprovements**

* [.NET] Added the `Offset` property to `GridDateTimeOffset`.
* [.NET] Improved column auto-generation to create `GridDateTimeColumn` objects for date and time data types.
* [.NET] Added `IAutomationProperties` interface support.
* [.NET] Added nullable Boolean support for `AutomationEnabled`.
* [.NET] Added the `LostFocusEditMode` property.
* [.NET] Added support for clearing cell values when deselecting a ComboBox editor in a nullable `DataMap` column.

Bug Fixes

* [.NET Framework] Fixed an issue where the text box did not receive focus when editing a cell containing a toggle icon.
* [.NET Framework] Fixed an issue where toggling a group updated the scroll position before selection, causing incorrect cell selection.
* [.NET] Fixed an issue where drag-and-drop row reordering failed when `TransposedGridBehavior` was applied.
* [.NET] Fixed an issue where incorrect adapter dimensions caused row `ActualHeight` values to report incorrect sizes.
* [.NET] Fixed an issue where selecting **Sort By** from the sort drop-down triggered a `System.ArgumentOutOfRangeException`.
* [.NET] Fixed an issue where resizing or scrolling in a secondary <span data-highlighted="true" data-vc="highlighted-text">XAML</span> window threw a `System.ArgumentOutOfRangeException` when `AutomationEnabled=True` and `TransposedGridBehavior` was applied.
* [.NET] Fixed an issue where `DataMap` drop-down items in `GridColumn` did not populate when edit mode was entered by double-clicking a cell.
* [.NET] Fixed an issue where selecting **Apply** or **Clear** in `GridFilterRow` options caused a `NullReferenceException`.
* [.NET] Fixed an issue where accessing `CellFactory` and `PropertyInfo` on unattached columns caused a `NullReferenceException`.
* [.NET] Fixed an issue where mouse wheel scrolling caused a `System.ArgumentOutOfRangeException`.
* [.NET] Fixed an issue where setting `Aggregate` and `Format` on `DateTime` columns with `GridSummaryRow` caused exceptions.
* [.NET] Fixed an issue where grouping and aggregation failed with `FlexGridDetailProvider`. Group collapse and aggregate calculations were applied only to the first row in each group.
* [.NET] Fixed an issue where checkbox editing could not be canceled when the `Cancel` property was set to `true` in the `BeginningEdit` or `BeginningRowEdit` events.

## GridControl

**Improvements**

* [.NET] Added the `LostFocusEditMode` property.

**Bug Fixes**

* [.NET] Fixed an issue where layout values exceeded valid bounds by enforcing value clamping.
* [.NET] Fixed an issue where a custom mouse cursor set through `Mouse.OverrideCursor` reverted to the default cursor when hovering over the grid.

## Grid.Excel

**Bug Fixes**

* [.NET] Fixed an issue where export failed because of a `DS.Documents.Excel` dependency version mismatch. Updated the referenced version to 7.2.5.

## Input

**Breaking Changes**

* [.NET] Removed the `HeaderClickInterceptor` and `ComboHeader` template parts. Replaced them with `Header` and `TextBox`.
* [.NET] Renamed `C1ComboBoxSelectionMode` to `ComboBoxSelectionMode`.
* [.NET] Renamed `C1ComboBoxItem` and `C1ComboBoxGroupItem` to `ComboBoxItem` and `ComboBoxGroupItem`.
* [.NET] Removed `C1ComboBox.IsOpenKey()`.

**Improvements**

* [.NET] Added the `C1AutoCompleteTextBox.Complete()` method.

**Bug Fixes**

* [.NET] Fixed an issue where the ComboBox drop-down could not be reopened after selecting an item.
* [.NET] Fixed an issue where the ComboBox drop-down did not open automatically when `IsDropDownOpen` was set to `true`.
* [.NET] Fixed an issue where a `System.ArgumentOutOfRangeException` occurred in `C1.DataCollection.dll` when Enter was pressed after focusing the text area.
* [.NET] Fixed an issue where a `System.NullReferenceException` occurred in `SelectionChanged` when handling ComboBox items separated by spaces.
* [.NET] Fixed an issue where `C1DockControl` UI elements, including content, tabs, and buttons, were not exposed in the UI visual tree.
* [.NET] Fixed an issue where a `System.Exception` occurred when a reset notification was received from the data source.
* [.NET] Fixed an issue where the `ValidateInput` event of `C1ComboBox` did not trigger on text input or item selection changes.

## ListView

**Breaking Changes**

* [.NET] Removed the `ShowCaption` visual state group and renamed the `Caption` template to `SelectAll`.
* [.NET] Removed the unused `ViewportGap` and `ViewportPreviewGap` properties.

**Improvements**

* [.NET] Improved UI automation support.
* [.NET] Added `IAutomationProperties` support.

**Bug Fixes**

* [.NET] Fixed an issue where `ItemTemplate` was applied incorrectly to grouped items when grouping was enabled and no `GroupStyle` was defined.
* [.NET] Fixed an issue where newly added `ListViewItem` content did not render when added through the Items collection editor while `C1ListView` was bound to `C1PropertyGrid`.
* [.NET] Fixed an issue where running the TreeViewExplorer sample caused a `System.ArgumentOutOfRangeException` in `C1.DataCollection.dll`.
* [.NET] Fixed an issue where the **Select All** checkbox remained enabled even when `CanSelectAll` was set to `false`.
* [.NET] Fixed an issue where a `ListViewItem` was not selected at runtime even though `IsSelected` was set to `True` at design time.
* [.NET] Fixed an issue where `SelectedIndex` set in <span data-highlighted="true" data-vc="highlighted-text">XAML</span> was not applied correctly and later `ItemsSource` updates did not properly refresh the selection state.
* [.NET] Fixed an issue where deselection in `SelectionMode=Multiple` did not clear selected items.
* [.NET] Fixed an issue where `PageUp` and `PageDown` navigation caused a `System.ArgumentOutOfRangeException` after runtime data source updates.
* [.NET] Fixed an issue where the automation peer threw exceptions when accessing non-visible items.

## RichTextBox

**Bug Fixes**

* [.NET Framework] Fixed an issue where tables with merged cells rendered inconsistently.

## TabControl

**Improvements**

* [.NET] Added `IAutomationProperties` support.

## Theming

**Bug Fixes**

* [.NET Framework] Fixed an issue where the **Select All** checkbox in the FlexGrid filter drop-down did not display the indeterminate state when themes were applied.