How to switch tabPages through accelerator keys and it should switch only when the keys are combined with 'Alt' key in WinForms TabControlAdv?

private void tabControlAdv1_KeyDown(object sender, System.Windows.Forms.KeyEventArgs e)
{
   if(e.Alt == false)
   {
      this.tabControlAdv1.SelectedIndexChanging += new Syncfusion.Windows.Forms.Tools.SelectedIndexChangingEventHandler(tabControlAdv1_SelectedIndexChanging);
   }
   else if(e.Alt == true)
   {
      this.tabControlAdv1.SelectedIndexChanging +=new Syncfusion.Windows.Forms.Tools.SelectedIndexChangingEventHandler(tabControlAdv1_SelectedIndexChanging_1);
   }
}
private void tabControlAdv1_SelectedIndexChanging(object sender, Syncfusion.Windows.Forms.Tools.SelectedIndexChangingEventArgs args)
{
   args.Cancel = true;
}
private void tabControlAdv1_SelectedIndexChanging_1(object sender, Syncfusion.Windows.Forms.Tools.SelectedIndexChangingEventArgs args)
{
   args.Cancel = false;
}

Private Sub tabControlAdv1_KeyDown(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyEventArgs) Handles tabControlAdv1.KeyDown
   If e.Alt = False Then
      AddHandler tabControlAdv1.SelectedIndexChanging, AddressOf tabControlAdv1_SelectedIndexChanging
   Else If e.Alt = True Then
      AddHandler tabControlAdv1.SelectedIndexChanging, AddressOf tabControlAdv1_SelectedIndexChanging_1
   End If
End Sub
Private Sub tabControlAdv1_SelectedIndexChanging(ByVal sender As Object, ByVal args As Syncfusion.Windows.Forms.Tools.SelectedIndexChangingEventArgs)
   args.Cancel = True
End Sub
Private Sub tabControlAdv1_SelectedIndexChanging_1(ByVal sender As Object, ByVal args As Syncfusion.Windows.Forms.Tools.SelectedIndexChangingEventArgs)
   args.Cancel = False
End Sub