public sealed class ExpandBehavior :
    ChangeTextBehaviorBase

Public NotInheritable Class ExpandBehavior
    Inherits ChangeTextBehaviorBase

using DevExpress.AIIntegration.WinForms;

//...
public partial class Forms : DevExpress.XtraEditors.XtraForm {
    public MemoEdit() {
        InitializeComponent();
        behaviorManager1.Attach<ExpandBehavior>(memoEdit1, behavior => {
            //behavior.Properties.Temperature = 0.6f;
            //behavior.Properties.PromptAugmentation = "Always translate the result into English.";
        });
    }
}

Imports DevExpress.AIIntegration.WinForms

'...
Partial Public Class Forms
    Inherits DevExpress.XtraEditors.XtraForm

    Private Function MemoEdit() As Public
        InitializeComponent()
        behaviorManager1.Attach(Of ExpandBehavior)(memoEdit1, Sub(behavior)
            'behavior.Properties.Temperature = CSng(0.5)
            'behavior.Properties.PromptAugmentation = "Always translate the result into English."
        End Sub)
    End Function
End Class

internal static class Program {
    [STAThread]
    static void Main() {
        //...
        // The Initialize() method forcibly initializes the behavior manager in .NET Framework apps.
        DevExpress.AIIntegration.WinForms.BehaviorInitializer.Initialize();
        Application.Run(new Form1());
    }
}