mes-client/UAS_MES_JH/CustomControl/ComBoxWithFocus/ComBoxWithFocus.cs

using System;
using System.Drawing;
using System.Windows.Forms;

namespace UAS_MES_NEW.CustomControl.ComBoxWithFocus
{
    public partial class ComBoxWithFocus : ComboBox
    {
        public ComBoxWithFocus()
        {
            InitializeComponent();
            this.Enter += this.ComBoxWithFocus_Enter;
            this.Leave += this.ComBoxWithFocus_Leave;
        }

        private void ComBoxWithFocus_Enter(object sender, EventArgs e)
        {
            this.BackColor = Color.GreenYellow;
        }

        private void ComBoxWithFocus_Leave(object sender, EventArgs e)
        {
            this.BackColor = Color.White;
        }
    }
}