Sizable Panel Csharp

//
//Add a new class to your project and paste the code shown below.  
//Compile.  
//Drop the new control from the top of the toolbox onto your form. 
//by Hans Passant.
// http://social.msdn.microsoft.com/Forums/en-US/Vsexpressvcs/thread/a184f136-0e54-4b56-86be-9a1c57212344/
using System;
using System.Drawing;
using System.Windows.Forms;
 
public class SizeablePanel : Panel {
  private const int cGripSize = 20;
  private bool mDragging;
  private Point mDragPos;
 
  public SizeablePanel() {
    this.DoubleBuffered = true;
    this.SetStyle(ControlStyles.ResizeRedraw, true);
    this.BackColor = Color.White;
  }
 
  protected override void OnPaint(PaintEventArgs e) {
    ControlPaint.DrawSizeGrip(e.Graphics, this.BackColor,
      new Rectangle(this.ClientSize.Width - cGripSize, this.ClientSize.Height - cGripSize, cGripSize, cGripSize));
    base.OnPaint(e);
  }
 
  private bool IsOnGrip(Point pos) {
    return pos.X >= this.ClientSize.Width - cGripSize &&
           pos.Y >= this.ClientSize.Height - cGripSize;
  }
 
  protected override void OnMouseDown(MouseEventArgs e) {
    mDragging = IsOnGrip(e.Location);
    mDragPos = e.Location;
    base.OnMouseDown(e);
  }
 
  protected override void OnMouseUp(MouseEventArgs e) {
    mDragging = false;
    base.OnMouseUp(e);
  }
 
  protected override void OnMouseMove(MouseEventArgs e) {
    if (mDragging) {
      this.Size = new Size(this.Width + e.X - mDragPos.X,
        this.Height + e.Y - mDragPos.Y);
      mDragPos = e.Location;
    }
    else if (IsOnGrip(e.Location)) this.Cursor = Cursors.SizeNWSE;
    else this.Cursor = Cursors.Default;
    base.OnMouseMove(e);
  }
}
누구나 수정하실 수 있습니다. 위키 사용법 참고하세요.