using System.ComponentModel; using System.Windows.Forms; namespace TweetDuck.Controls { sealed class NumericUpDownEx : NumericUpDown { public string TextSuffix { get; set ; } protected override void UpdateEditText() { base.UpdateEditText(); if (LicenseManager.UsageMode != LicenseUsageMode.Designtime) { ChangingText = true; Text += TextSuffix; ChangingText = false; } } } }