Button Extensions

Updated on Sep 15, 2025

The Telerik suite provides built-in extensions that can change different behaviors of the button controls. This article will go through these extensions.

DropDownExtensions

• HandleMouseWheelWhenOpen: A boolean property that gets or sets if the MouseWheel event is handled while a drop-down content of a drop-down button is open. By setting this property to true you won't be able to scroll your page while the drop-down content is open. The default value is false.

his property can be set on the following controls: RadDropDownButton, RadSplitButton, RadColorPicker, RadTimeSpanPicker, RadDateTimePicker, RadBreadCrumb.

Example 1: Set HandleMouseWheelWhenOpen attached property

XAML

	<ScrollViewer Height="120">
		<StackPanel Height="800" Background="Bisque">
			<telerik:RadDropDownButton Content="Drop Down Button"  VerticalAlignment="Top" HorizontalAlignment="Left" telerik:DropDownExtensions.HandleMouseWheelWhenOpen="True">
				<telerik:RadDropDownButton.DropDownContent>
					<telerik:RadListBox Height="50">
						<telerik:RadListBoxItem Content="item 1"/>
						<telerik:RadListBoxItem Content="item 2"/>
						<telerik:RadListBoxItem Content="item 3"/>
						<telerik:RadListBoxItem Content="item 4"/>
						<telerik:RadListBoxItem Content="item 5"/>
						<telerik:RadListBoxItem Content="item 6"/>
						<telerik:RadListBoxItem Content="item 7"/>
						<telerik:RadListBoxItem Content="item 8"/>
					</telerik:RadListBox>
				</telerik:RadDropDownButton.DropDownContent>
			</telerik:RadDropDownButton>
		</StackPanel>
	</ScrollViewer>

his property is not supported when the control (for example, RadDropDownButton) has its KeepOpen property set to True.

DropDownButtonExtensions

• FocusContentOnOpen: A boolean property that gets or sets if the drop-down content of a drop-down button control should be focused when its drop-down content is open. The default value is false.

Example 2: Set FocusContentOnOpen attached property

XAML

	<telerik:RadDropDownButton Content="Drop Down Button"  VerticalAlignment="Top" HorizontalAlignment="Left" telerik:DropDownButtonExtensions.FocusContentOnOpen="True">
		<telerik:RadDropDownButton.DropDownContent>
			<telerik:RadListBox >
				<telerik:RadListBoxItem Content="item 1"/>
				<telerik:RadListBoxItem Content="item 2"/>
				<telerik:RadListBoxItem Content="item 3"/>
				<telerik:RadListBoxItem Content="item 4"/>
			</telerik:RadListBox>
		</telerik:RadDropDownButton.DropDownContent>
	</telerik:RadDropDownButton>

See Also

• EventToCommandBehavior
• Attached Behavior
• DelegateCommand