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As of R1 2019, the RadExpressionEditor control allows users to expand complex objects and access their sub-properties. This functionality is controlled by the new IsFieldsDrillDownEnabled property.

Example 1: Enabling drill-down in XAML

<telerik:RadExpressionEditor IsFieldsDrillDownEnabled="True" /> 

Example 2: Enabling drill-down in code-behind

this.radExpressionEditor.IsFieldsDrillDownEnabled = true; 
Me.radExpressionEditor.IsFieldsDrillDownEnabled = True 

Figure 1 illustrates the difference between the functionality being disabled and enabled.

Figure 1: Drill-down functionality

Drill-down functionality

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