What is the DataContext of RadComboBox.MultipleSelectionBoxTemplate?

[Joshua]

I have a data-driven application architecture and my expectation is that MultipleSelectionBoxTemplate shares the same DataContext as the parent RadComboBox because it does not apply to any particular item. This is very confusing.

[Martin Ivanov]

Hello Joshua,

The DataContext passed to the MultipleSelectionBoxTemplate is the value of the SelectionBoxItem property of RadComboBox. The SelectionBoxItem property is synced with the Text property of the control when the multiple selection is enabled. In other words, the DataContext is a string. 

If you need to have the DataContext of the RadComboBox control, you can adjust this explicitly. For example:

<telerik:RadComboBox x:Name="comboBox" AllowMultipleSelection="True">
	<telerik:RadComboBox.MultipleSelectionBoxTemplate>
		<DataTemplate>
			<TextBlock Text="{Binding ElementName=comboBox, Path=DataContext}" />
		</DataTemplate>
	</telerik:RadComboBox.MultipleSelectionBoxTemplate>
</telerik:RadComboBox>

Regards,
Martin Ivanov
Progress Telerik