using System.ComponentModel; using System.Windows.Forms; namespace TweetDuck.Core.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; } } } }