Private Sub UltraCombo1_KeyDown(sender As Object, e As System.Windows.Forms.KeyEventArgs) Handles UltraCombo1.KeyDown
        If e.KeyData = Keys.Control + Keys.F2 Then
              e.Handled = True
              Me.UltraCombo1.SelectedText = "%"
        End If
    End Sub

Hereby he returns to me the value "%" when I pulsate contrl F2.

 Private Sub UltraComboEditor1_KeyDown(sender As Object, e As System.Windows.Forms.KeyEventArgs) Handles UltraComboEditor1.KeyDown
        If e.KeyData = Keys.Control + Keys.F2 Then
            e.Handled = True
            Me.UltraComboEditor1.SelectedText = "%"
        End If
    End Sub

 Hereby he does not return to me the value "%".
He returns the following mistake to me

Excepción no controlada del tipo 'System.StackOverflowException'
en Infragistics2.Win.UltraWinGrid.v10.3.dll

how I can return the value "%" without the error?

Thank you