RadControls for WPF
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The UpdateValueEvent property of the RadMaskedTextBox allows you to specify when the Value property will be changed. If UpdateValueEvent is set to PropertyChanged, the Value will be changed on every key stroke, assuming that you are typing. If the UpdateValueEvent is set to LostFocus, the Value will be changed only after the RadMaskedTextBox loses focus.

CopyXAML
<!--  Setting UpdateValueEvent to LostFocus  -->
<telerik:RadMaskedTextBox x:Name="radMaskedTextBox" 
                          Mask="c3"
                          MaskType="Numeric"
                          UpdateValueEvent="LostFocus" />

<!--  Setting UpdateValueEvent to PropertyChanged  -->
<telerik:RadMaskedTextBox x:Name="radMaskedTextBox2" 
                          Mask="c3"
                          MaskType="Numeric"
                          UpdateValueEvent="PropertyChanged" />
Tip
The default value of the RadMaskedTextBox's UpdateValueEvent property is UpdateValueEvent.PropertyChanged.

See Also