.NET (Core and Framework)

private void ctlSoundScene_Paint(object sender, System.Windows.Forms.PaintEventArgs e)
{
	Bitmap oBitmap = new Bitmap(100, 100 ,e.Graphics);
	Graphics oBuffer = Graphics.FromImage(oBitmap);
	oBuffer.FillRectangle(new SolidBrush(Color.DarkMagenta), 10,10,30,30);   
	e.Graphics.DrawImage(oBitmap, 10,10);
...
...
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this.blah = this.control.property.blah;

blah = control.property.blah;

	public class CollapsablePanel : System.Windows.Forms.Panel
	{
		private System.ComponentModel.IContainer components;
		private System.Windows.Forms.Label labelExpand;
		private System.Windows.Forms.Label labelTitle;
		private int panelHeight;

		#region Windows Form Designer generated code
		private void InitializeComponent()
		{
			this.labelTitle = new System.Windows.Forms.Label();
			this.labelExpand = new System.Windows.Forms.Label();
			this.SuspendLayout();
			// 
			// labelTitle
			// 
			this.labelTitle.BackColor = System.Drawing.SystemColors.ActiveCaption;
			this.labelTitle.Cursor = System.Windows.Forms.Cursors.Default;
			this.labelTitle.Dock = System.Windows.Forms.DockStyle.Top;
			this.labelTitle.Font = new System.Drawing.Font("Tahoma", 9F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((System.Byte)(0)));
			this.labelTitle.ForeColor = System.Drawing.SystemColors.ActiveCaptionText;
			this.labelTitle.Name = "labelTitle";
			this.labelTitle.Size = new System.Drawing.Size(200, 24);
			this.labelTitle.TabIndex = 0;
			this.labelTitle.Text = "Title";
			this.labelTitle.TextAlign = System.Drawing.ContentAlignment.MiddleLeft;
			// 
			// labelExpand
			// 
			this.labelExpand.Anchor = System.Windows.Forms.AnchorStyles.None;
			this.labelExpand.BackColor = System.Drawing.SystemColors.ActiveBorder;
			this.labelExpand.Cursor = System.Windows.Forms.Cursors.Hand;
			this.labelExpand.Location = new System.Drawing.Point(229, 142);
			this.labelExpand.Name = "labelExpand";
			this.labelExpand.Size = new System.Drawing.Size(24, 24);
			this.labelExpand.TabIndex = 1;
			this.labelExpand.Click += new System.EventHandler(this.labelExpand_Click);
			// 
			// CollapsablePanel
			// 
			this.Anchor = System.Windows.Forms.AnchorStyles.None;
			this.Controls.AddRange(new System.Windows.Forms.Control[] {
																		  this.labelTitle,
																		  this.labelExpand});
			this.Resize += new System.EventHandler(this.CollapsablePanel_Resize);
			this.ResumeLayout(false);

		}
#endregion

		/// 
		/// Initialises a new instance of CollapsiblePanel.
		/// 
		public CollapsablePanel() : base()
		{
			this.components = new System.ComponentModel.Container();

			InitializeComponent();

			// Set the background colour to ControlLightLight
			this.BackColor = SystemColors.ControlLightLight;
			labelExpand.BringToFront();
		}

		/// 
		/// Gets the text displayed as the panel title.
		/// 
		[Category("Title")]
		public string TitleText
		{
			get
			{
				return this.labelTitle.Text;
			}
			set
			{
				this.labelTitle.Text = value;
			}
		}

		/// 
		/// Gets the background colour for the title bar.
		/// 
		[Category("Title")]
		public Color TitleBackColour
		{
			get
			{
				return this.labelTitle.BackColor;
			}
			set
			{
				this.labelTitle.BackColor = value;
				this.labelExpand.BackColor = value;
			}
		}

		/// 
		/// Gets the foreground colour used for the title bar.
		/// 
		[Category("Title")]
		public Color TitleForeColour
		{
			get
			{
				return this.labelTitle.ForeColor;
			}
			set
			{
				this.labelTitle.ForeColor = value;
			}
		}

		/// 
		/// Gets the font used for the title bar text.
		/// 
		[Category("Title")]
		public Font TitleFont
		{
			get
			{
				return this.labelTitle.Font;
			}
			set
			{
				this.labelTitle.Font = value;
			}
		}

		/// 
		/// Gets the image list used for the expand/collapse image.
		/// 
		[Category("Title")]
		public ImageList ImageList
		{
			get
			{
				return this.labelExpand.ImageList;
			}
			set
			{
				this.labelExpand.ImageList = value;

				if(labelExpand.ImageList != null)
					if(labelExpand.ImageList.Images.Count > 1)
						ImageIndex = 0;
			}
		}

		/// 
		/// Gets the index into the image list of the currently displayed image.
		/// 
		[Category("Title")]
		public int ImageIndex
		{
			get
			{
				return this.labelExpand.ImageIndex;
			}
			set
			{
				this.labelExpand.ImageIndex = value;
			}
		}

		private void labelExpand_Click(object sender, System.EventArgs e)
		{
			if((null != labelExpand.ImageList) && (labelExpand.ImageList.Images.Count >=2))
			{
				if(0 == labelExpand.ImageIndex)
				{
					// Currently expanded, so store the current height.
					this.panelHeight = this.Height;
					// Collapse the panel
					this.Height = labelTitle.Height;
					// Update the image.
					labelExpand.ImageIndex = 1;
				}
				else
				{
					// Currently collapsed, so expand the panel.
					this.Height = this.panelHeight;
					// Update the image.
					labelExpand.ImageIndex = 0;
				}
			}
		}

		private void CollapsablePanel_Resize(object sender, System.EventArgs e)
		{
			labelExpand.Location = new Point(Width - labelExpand.Width, 0);			
		}
	}