The clear button is clearing the input field in the PropertyGrid but the value on the model is never set.
<DataTemplate x:Key="RequiredCondition"> <telerik:RadComboBox ItemsSource="{Binding Path=DataContext.Conditions, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type views:PropertyEditorView}}, Mode=OneWay}" DisplayMemberPath="Name" SelectedItem="{Binding CurrentPropertySet[RequiredCondition]}" ToolTip="{Binding ElementName=cboRequiredCondition, Path=SelectionBoxItem.Description}" ClearSelectionButtonContent="Clear" ClearSelectionButtonVisibility="Visible" TextSearchMode="Contains" x:Name="cboRequiredCondition"/> </DataTemplate>