Sample로 WindowsForm에 Panel 하나와 PictureBox 3개 (Control) 를 배치하여 테스트 함. public partial class Form1 : Form { Random rnd = new Random(); public Form1() { InitializeComponent(); } private void Form1_Load(object sender, EventArgs e) { this.panel1.AllowDrop = true; foreach(Control c in this.panel1.Controls) { c.MouseDown += new MouseEventHandler(C_MouseDown); } this.panel1.DragOver += new DragEventHandl..