Events

Updated on Sep 24, 2025

You can handle the following events when using the RadTimeBar for a very rich user experience with the control:

• GroupIntervalChanged: Fires when interval groups drill level changed.

• HoveredPeriodChanged: Fires when the time period hovered changes.

• ItemIntervalChanged: Fires when the interval items drill level changed.

• VisiblePeriodChanged: Fires when the period that is currently visible has changed as we scroll and zoom within the control.

• SelectionChanged: Fires when the time period selection has changed.

• ActualSelectionChanged: Fires when the selected time period is changing, i.e., when the user is dragging one of the selection thumbs. The ActualSelectionStart and ActualSelectionEnd properties will hold the selected period at this point.

For example you can get the current item interval using the TimeBar.ItemIntervalChanged event via the TimeBar.CurrentItemInterval property. This event will also fire on initial load, when the best current item interval is set.

C#

	public MainPage()
	{
		InitializeComponent();
		radTimeBar1.ItemIntervalChanged += new EventHandler<DrillEventArgs>(radTimeBar1_ItemIntervalChanged);
	}

	void radTimeBar1_ItemIntervalChanged(object sender, DrillEventArgs e)
	{
		if (radTimeBar1.CurrentItemInterval is MonthInterval)
		{
			radTimeBar1.SelectionStart = new DateTime(2012, 05, 1);
			radTimeBar1.SelectionEnd = new DateTime(2012, 07, 1);
		}
	}

VB.NET

	   public MainPage()
	   Public Sub New()
		InitializeComponent()
		AddHandler radTimeBar1.ItemIntervalChanged,      AddressOf radTimeBar1_ItemIntervalChanged
	   End Sub
	
	Private Sub radTimeBar1_ItemIntervalChanged(ByVal sender As Object, ByVal e As DrillEventArgs)
				If TypeOf  radTimeBar1.CurrentItemInterval Is MonthInterval Then
					 radTimeBar1.SelectionStart = New Date(2012, 05, 1)
					 radTimeBar1.SelectionEnd = New Date(2012, 07, 1)
				End If
	End Sub

The same approach is applicable for groups - In order to get the current group interval you can use TimeBar.GroupIntervalChanged event and TimeBar.CurrentGroupInterval property respectively.

See Also

• Properties