Behavior Class

Behavior Class

Represents the Behavior objects that are managed by a BehaviorService.

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

public ref class Behavior abstract

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.

// By providing our own behavior we can do something 
// interesting when the user clicks or manipulates our glyph. 
public   ref class DemoBehavior : public Behavior
    bool OnMouseUp(Glyph^ g, MouseButtons^ button)
        MessageBox::Show("Hey, you clicked the mouse here");

        // indicating we processed this event. 
        return true;

public ref class DemoGlyph : public Glyph
    Control^ control;
    BehaviorService^ behavior;

    DemoGlyph(BehaviorService^ behavior, Control^ control):
      Glyph(gcnew BehaviorServiceSample::DemoBehavior)
          this->behavior = behavior;
          this->control = control;

    virtual property Rectangle Bounds
        Rectangle get() override
            // 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 = behavior->ControlToAdornerWindow(control);
            Size size = control->Size;
            Point center = Point(edge.X + (size.Width / 2),
                edge.Y + (size.Height / 2));

            Rectangle bounds = Rectangle(center.X - 5,
                center.Y - 5, 10, 10);

            return bounds;

    virtual Cursor^ GetHitTest(Point p) override
        // 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 nullptr;

    virtual void Paint(PaintEventArgs^ pe) override
        // Draw our glyph.  Our's is simple:  a blue ellipse.
        pe->Graphics->FillEllipse(Brushes::Blue, Bounds);


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 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

.NET Framework

Supported in: 3.5, 3.0, 2.0

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