Enable snapping to PeriodStart and PeriodEnd as well, when IsSnapToIntervalEnabled is set to "true"

Add the ability to extend/contract the current selection by Shift-clicking. This can be used along with the "IsSnapToIntervalEnabled" property.

RadTimeBar throws XamlParseException when current culture is arabic.

Workaround: Create a custom class that inherits from Telerik.Windows.Controls.TimeBar.SelectionThumb and explicitly sets the TitleFormatString property to your custom format string in the constructor. Edit the Template of the RadTimeBar control - find the SelectionThumb instance in the template and replace it with an instance of the CustomSelectionThumb class.

If the PeriodStart and VisiblePeriodStart is set to DateTime.MinValue zooming out using mouse wheel causes a crash. DateTime.Subract(TimeSpan value) method throws "ArgumentOutOfRangeException();". Looks like "TimeBarBase.CalculateLeftRightStep(this.SmallChange, centerOffsetPercentage, out leftStep, out rightStep);" does not calculate leftStep correctly.

The values of VisiblePeriodStart and VisiblePeriodEnd properties are not respected after runtime theme change.