[DXCategory("Appearance")]
public virtual ControlNavigator EmbeddedNavigator { get; }

<DXCategory("Appearance")>
Public Overridable ReadOnly Property EmbeddedNavigator As ControlNavigator

using System.Windows.Forms;
using DevExpress.XtraEditors;

public Form1() {
    InitializeComponent();
    // Binds the Grid control to a data source.
    gridControl1.DataSource = GetData();
    // Handles clicks on data navigator buttons.
    gridControl1.EmbeddedNavigator.ButtonClick += EmbeddedNavigator_ButtonClick;
}
private void EmbeddedNavigator_ButtonClick(object sender, NavigatorButtonClickEventArgs e) {
    if(e.Button.ButtonType == NavigatorButtonType.Remove)
        e.Handled = XtraMessageBox.Show("Do you want to delete the record?", "Warning", MessageBoxButtons.YesNo) == DialogResult.No;
}

Imports System.Windows.Forms
Imports DevExpress.XtraEditors

Public Sub New()
    InitializeComponent()
    ' Binds the Grid control to a data source.
    gridControl1.DataSource = GetData()
    ' Handles clicks on data navigator buttons.
    AddHandler gridControl1.EmbeddedNavigator.ButtonClick, AddressOf EmbeddedNavigator_ButtonClick
End Sub
Private Sub EmbeddedNavigator_ButtonClick(ByVal sender As Object, ByVal e As NavigatorButtonClickEventArgs)
    If e.Button.ButtonType = NavigatorButtonType.Remove Then
        e.Handled = XtraMessageBox.Show("Do you want to delete the record?", "Warning", MessageBoxButtons.YesNo) = DialogResult.No
    End If
End Sub

ControlNavigator navigator = gridControl1.EmbeddedNavigator;
    navigator.Buttons.BeginUpdate();
    try {
        navigator.Buttons.Append.Visible = false;
        navigator.Buttons.Remove.Visible = false;
    }
    finally {
        navigator.Buttons.EndUpdate();
    }

Dim navigator As ControlNavigator = GridControl1.EmbeddedNavigator
    navigator.Buttons.BeginUpdate()
    Try
        navigator.Buttons.Append.Visible = False
        navigator.Buttons.Remove.Visible = False
    Finally
        navigator.Buttons.EndUpdate()
    End Try