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I'm using the following code to add a movable Frame control to a picturebox and add a translucent background to the outer area of the frame.But the black translucent color is not appearing outside the frame as intended.It is supposed to fill up all the area outside the frame.On dragging the frame its producing the black area where its dragged.

I'm using a picturebox with size mode set to Zoom.

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace DXApplication5

 public partial class Form1 : DevExpress.XtraEditors.XtraForm
 
 public Form1()
 
 InitializeComponent();
 pictureBox1.Paint += PictureBox1_Paint;
 

 private void PictureBox1_Paint(object sender, PaintEventArgs e)
 
 if (pictureBox1.Controls.Count > 0)
 
 e.Graphics.ExcludeClip(pictureBox1.Controls[0].Bounds);
 using (var b = new SolidBrush(Color.FromArgb(100, Color.Black)))
 e.Graphics.FillRectangle(b, pictureBox1.ClientRectangle);
 
 

 private void button1_Click(object sender, EventArgs e)
 
 var s = 300;
 var c = new FrameControl();
 c.Size = new Size(s, s);
 c.Location = new Point((pictureBox1.Width - s) / 2, (pictureBox1.Height - s) / 2);
 pictureBox1.Controls.Add(c);
 

 private void Form1_Load(object sender, EventArgs e)
 

 
 

 public class FrameControl : Control
 
 public FrameControl()
 
 SetStyle(ControlStyles.SupportsTransparentBackColor, true);
 DoubleBuffered = true;
 ResizeRedraw = true;
 BackColor = Color.Transparent;
 
 protected override void OnPaint(PaintEventArgs e)
 
 base.OnPaint(e);
 using (var p = new Pen(Color.Black, 4))
 
 p.DashStyle = System.Drawing.Drawing2D.DashStyle.Dash;
 e.Graphics.DrawRectangle(p, 0, 0, Width - 1, Height - 1);
 
 
 const int WM_NCHITTEST = 0x84;
 const int WM_SETCURSOR = 0x20;
 const int WM_NCLBUTTONDBLCLK = 0xA3;
 protected override void WndProc(ref Message m)
 
 int borderWidth = 10;
 if (m.Msg == WM_SETCURSOR) /*Setting cursor to SizeAll*/
 
 if ((m.LParam.ToInt32() & 0xffff) == 0x2 /*Move*/)
 
 Cursor.Current = Cursors.SizeAll;
 m.Result = (IntPtr)1;
 return;
 
 
 if ((m.Msg == WM_NCLBUTTONDBLCLK)) /*Disable Mazimiz on Double click*/
 
 m.Result = (IntPtr)1;
 return;
 
 base.WndProc(ref m);
 if (m.Msg == WM_NCHITTEST)
 
 var pos = PointToClient(new Point(m.LParam.ToInt32() & 0xffff,
 m.LParam.ToInt32() >> 16));
 if (pos.X <= ClientRectangle.Left + borderWidth &&
 pos.Y <= ClientRectangle.Top + borderWidth)
 m.Result = new IntPtr(13); //TOPLEFT
 else if (pos.X >= ClientRectangle.Right - borderWidth &&
 pos.Y <= ClientRectangle.Top + borderWidth)
 m.Result = new IntPtr(14); //TOPRIGHT
 else if (pos.X <= ClientRectangle.Left + borderWidth &&
 pos.Y >= ClientRectangle.Bottom - borderWidth)
 m.Result = new IntPtr(16); //BOTTOMLEFT
 else if (pos.X >= ClientRectangle.Right - borderWidth &&
 pos.Y >= ClientRectangle.Bottom - borderWidth)
 m.Result = new IntPtr(17); //BOTTOMRIGHT
 else if (pos.X <= ClientRectangle.Left + borderWidth)
 m.Result = new IntPtr(10); //LEFT
 else if (pos.Y <= ClientRectangle.Top + borderWidth)
 m.Result = new IntPtr(12); //TOP
 else if (pos.X >= ClientRectangle.Right - borderWidth)
 m.Result = new IntPtr(11); //RIGHT
 else if (pos.Y >= ClientRectangle.Bottom - borderWidth)
 m.Result = new IntPtr(15); //Bottom
 else
 m.Result = new IntPtr(2); //Move
 
 
 

PicturBox just paints those part of the control which need repaint. Since have added the control at run-time after the picture box get visible, you need to invalidate picture box after adding FrameControl to repaint the entire control.

Consider calling Invalidate method of the parent of FrameControl when you add or remove it from the parent or when you change visibility of the control.

private void button1_Click(object sender, EventArgs e)

 var s = 300;
 var c = new FrameControl();
 c.Size = new Size(s, s);
 c.Location = new Point((pictureBox1.Width - s) / 2, (pictureBox1.Height - s) / 2);
 pictureBox1.Controls.Add(c);
 c.VisibleChanged
 pictureBox1.Invalidate();