In Development
Last Updated: 15 Mar 2024 11:35 by ADMIN

NullReferenceException is thrown if you set the IsChecked property of the RadToggleSwitchButton before the button is added to the visual tree. This happens only when the switch animation is disabled.

To work this around, you can set the AnimationManager.IsAnimationEnabled property of the button to True initially. And then set it back to False on Loaded of the button.

Completed
Last Updated: 11 Mar 2024 07:38 by ADMIN
Release 2024.1.228 (Preview)

RadToggleSwitchButton: The animation of the thumb switch updates its position when the animation finishes. This happens with a slight delay. However, if the animation is disabled, this delay should not be executed. Instead, the thumb should be updated immediately.
Currently, the delay can causes an animation-like effect in some specific situations.

To work this around, you can create a custom RadToggleSwitchButton and override the property changed callback of the IsChecked property.

public class CustomToggleSwitchButton : RadToggleSwitchButton
{
    private FrameworkElement thumb;

    static CustomToggleSwitchButton()
    {
        DefaultStyleKeyProperty.OverrideMetadata(typeof(CustomToggleSwitchButton), new FrameworkPropertyMetadata(typeof(CustomToggleSwitchButton)));
        IsCheckedProperty.OverrideMetadata(typeof(CustomToggleSwitchButton), new FrameworkPropertyMetadata(OnIsCheckedPropertyChanged));
    }

    public override void OnApplyTemplate()
    {
        base.OnApplyTemplate();
        this.thumb = this.GetTemplateChild("PART_Thumb") as FrameworkElement;
    }

    private static void OnIsCheckedPropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
    {
        var switchButton = (CustomToggleSwitchButton)d;

        if (switchButton.thumb == null)
        {
            return;
        }

        bool? isChecked = e.NewValue as bool?;
        if (isChecked == true)
        {
            switchButton.thumb.HorizontalAlignment = HorizontalAlignment.Right;                
        }
        else if (isChecked == false)
        {
            switchButton.thumb.HorizontalAlignment = HorizontalAlignment.Left;
        }
        else if (switchButton.IsThreeState)
        {
            switchButton.thumb.HorizontalAlignment = HorizontalAlignment.Center;
        }
    }
}

Won't Fix
Last Updated: 30 Nov 2022 16:33 by ADMIN
Clicking on a RadDropDownButton in the Visual Studio 17.4.0 designer makes it stop responding.
Completed
Last Updated: 28 Oct 2021 13:57 by ADMIN
Release LIB 2021.3.1101 (1 Nov 2021)

The application hangs when you click on a Label element placed in the DropDownContent of RadSplitButton. In order to recreate this the content of the Label should contain an underscore character, thus enabling the access text WPF functionality. Also, the CloseOnPopupMouseLeftButtonUp property should be set to True.

This behavior can be reproduced with any element that is not derived from FrameworkElement. The issue in this case appear because when the access text is enabled, the Label control produces Run elements in its visual tree. The Run class doesn't derive from FrameworkElement, but from FrameworkContentElement, which causes the issue.

To work this around, use TextBlock instead of Label.

Completed
Last Updated: 14 Feb 2020 13:43 by ADMIN
Release R1 2020 SP
If you host RadDropDownButton in a ScrollViewer and then start scrolling (using mouse wheel) while its dropdown content is opened, the scrolling works and the buttons goes outside of the viewport. However, the dropdown content (Popup) stays within the viewport, which looks like the dropdown gets detached from the control.

To avoid this, handle the scrolling of the ScrollViewer when the dropdown content is opened. This behavior is already implemented in RadComboBox by overriding its OnMouseWheel method and handling the event arguments.

To work this around subscribe to the MouseWheel event of RadDropDownButton and set the Handled property of the event arguments to True.

private void RadDropDownButton_MouseWheel(object sender, MouseWheelEventArgs e)
{
	var btn = (RadDropDownButton)sender;
	if (btn.IsOpen)
	{
		e.Handled = true;
	}            
}


Completed
Last Updated: 06 Nov 2019 09:36 by ADMIN
Release LIB 2019.3.1111
Completed
Last Updated: 05 Mar 2019 11:09 by ADMIN
The Command is not respected when clicking over the Hyperlink
Completed
Last Updated: 02 Apr 2018 10:03 by ADMIN
The current workaround we can offer is to define the following style for the RadioButton element:

			<Style TargetType="RadioButton" BasedOn="{StaticResource RadioButtonStyle}">
				<Style.Triggers>
					<Trigger Property="IsChecked" Value="True">
						<Setter Property="BorderBrush" Value="{telerik1:FluentResource ResourceKey=AccentBrush}" />
					</Trigger>
				</Style.Triggers>
			</Style>

Where 
        xmlns:telerik1="clr-namespace:Telerik.Windows.Controls;assembly=Telerik.Windows.Controls"
Declined
Last Updated: 11 Dec 2017 13:02 by ADMIN
ADMIN
Created by: Lance | Manager Technical Support
Comments: 0
Category: Buttons
Type: Bug Report
1
Custom property values for BorderThickness and BorderBrush are replaced after button click.

To reproduce, use the following code, you'll see that a highlighted border appears after clicking the button.

<telerik:RadButton Background="Gray"
                           Foreground="White"
                           BorderThickness="0"
                           BorderBrush="Transparent"
                           Content="click me"
                           HorizontalAlignment="Center"
                           VerticalAlignment="Center" />

Reason for declination: 
The border that you see is the focused state of RadButton, which is a separate visual and its BorderThickness is not template-bound to the BorderThickness of the control intentionally. We believe that a control should have focus even if its default border is removed. In our latest themes we are trying to keep this behavior. In the Office2016 theme there is an exposed palette property, which you can use in code-behind if you want to remove the focus: 
Office2016Palette.Palette.FocusThickness = new Thickness(0);
Completed
Last Updated: 09 Oct 2020 13:24 by ADMIN
Release LIB 2020.3.1012
A StackOverflowException occurs when you press a RadDropDownButton placed into the DropDownContent of another RadDropButton.

To work this around, subscribe for the LostMouseCapture event of the parent drop down button and handle it.

private void DropDownButton_LostMouseCapture(object sender, MouseEventArgs e)
{
      e.Handled = true;
}
Unplanned
Last Updated: 28 Sep 2023 10:49 by ADMIN
The UI freezes if the DropDownContent of RadDropDownButton has a native Run element and the CloseOnPopupMouseLeftButtonUp property is set to True.
Completed
Last Updated: 25 May 2023 13:36 by ADMIN
If you have a tooltip on a button and focus the button before hovering it, the tooltip is not shown
Completed
Last Updated: 19 Oct 2016 10:48 by Dominic
ADMIN
Created by: Peshito
Comments: 1
Category: Buttons
Type: Bug Report
1
There is a Dispatcher call without checking in the dispatcher call for NULL. This lead to NullReferenceException in huge production code.



Available in R3 2016 SP
Unplanned
Last Updated: 05 Jan 2017 09:52 by ADMIN
MouseLeave event is never fired after we change the Them of the controls from a control located in the DropDownContent. Therefor the controls IsMouseOver property is true and looks like it is hovered.
Completed
Last Updated: 25 Aug 2016 08:19 by ADMIN
The issue is not reproducible since R2 2016 SP1 version.
Unplanned
Last Updated: 03 Jan 2017 21:09 by ADMIN
DropDownButton's DropDownContent blinks when its template and its parent's ControlTemplate are changed at runtime
Completed
Last Updated: 10 Oct 2016 14:23 by ADMIN
The issue can be reproduced with DatePicker inside of ComboBoxItem ItemTemplate.

Available in LIB Version 2016.3.1010, it will be also available in the 2016 R3 SP1.
Declined
Last Updated: 04 Feb 2016 15:25 by ADMIN
Property values are inherited from the logical parent and not visual parent (as in SL). Thus ContentPresenter and ContentControls children doesn't get the new Foreground property. This can not be workarounded with VisualStates, but Triggers only

Reason for declination: WPF limitation
Unplanned
Last Updated: 05 Jan 2017 07:58 by ADMIN
Arg_COMException in some cases when used with RoutedUICommand
1 2