Behavior Class

Represents the Behavior objects that are managed by a BehaviorService.

Namespace: System.Windows.Forms.Design.Behavior
Assembly: System.Design (in

public abstract class Behavior
public abstract class Behavior
public abstract class Behavior
Not applicable.

This class can be extended to develop any type of user interface behavior, including selection, drag, and resize behaviors.

For more information, see Behavior Service Overview.


Your Behavior type must be associated with a Glyph type. Glyph-independent behaviors are not supported.

The following code example demonstrates how to create your own class based on the Behavior class that responds to user clicks. This code example is part of a larger example provided for the BehaviorService class.

class MyGlyph : Glyph
    Control control;
    BehaviorService behaviorSvc;

    public MyGlyph(BehaviorService behaviorSvc, Control control) : 
        base(new MyBehavior())
        this.behaviorSvc = behaviorSvc;
        this.control = control;

    public override Rectangle Bounds
            // Create a glyph that is 10x10 and sitting
            // in the middle of the control.  Glyph coordinates
            // are in adorner window coordinates, so we must map
            // using the behavior service.
            Point edge = behaviorSvc.ControlToAdornerWindow(control);
            Size size = control.Size;
            Point center = new Point(edge.X + (size.Width / 2), 
                edge.Y + (size.Height / 2));

            Rectangle bounds = new Rectangle(
                center.X - 5,
                center.Y - 5,

            return bounds;

    public override Cursor GetHitTest(Point p)
        // GetHitTest is called to see if the point is
        // within this glyph.  This gives us a chance to decide
        // what cursor to show.  Returning null from here means
        // the mouse pointer is not currently inside of the glyph.
        // Returning a valid cursor here indicates the pointer is
        // inside the glyph, and also enables our Behavior property
        // as the active behavior.
        if (Bounds.Contains(p))
            return Cursors.Hand;

        return null;

    public override void Paint(PaintEventArgs pe)
        // Draw our glyph. It is simply a blue ellipse.
        pe.Graphics.FillEllipse(Brushes.Blue, Bounds);

    // By providing our own behavior we can do something interesting
    // when the user clicks or manipulates our glyph.
    class MyBehavior : Behavior
        public override bool OnMouseUp(Glyph g, MouseButtons button)
            MessageBox.Show("Hey, you clicked the mouse here");
            return true; // indicating we processed this event.


Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

Windows 98, Windows Server 2000 SP4, Windows Millennium Edition, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0

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