Why MouseMove event is different?

Hello, I wondering why the mouseMove event is different vs the normal controls?

In the normal objects the MouseMoveEvent continues if the mouse was pressed(Down) and the cursor leaves the control.

By ex, I have the following code:

Public Class Form1
  Private mbox As New MoveBox

  Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
    mbox.Location = New Point(30, 30)
    Me.Controls.Add(mbox)
  End Sub
End Class

Public Class MoveBox
  Inherits PictureBox

  Private _isActive As Boolean
  Public Sub New()
    Me.Size = New Size(10, 10)
    Me.BackColor = Color.Blue
  End Sub

  Protected Overrides Sub OnMouseDown(ByVal e As System.Windows.Forms.MouseEventArgs)
    MyBase.OnMouseDown(e)
    _isActive = True
  End Sub

  Protected Overrides Sub OnMouseUp(ByVal e As System.Windows.Forms.MouseEventArgs)
    MyBase.OnMouseUp(e)
    _isActive = False
  End Sub

  Protected Overrides Sub OnMouseMove(ByVal e As System.Windows.Forms.MouseEventArgs)
    MyBase.OnMouseMove(e)
    If Me._isActive Then
      Me.Location = Me.Location + e.Location - New Point(Me.Width \ 2, Me.Height \ 2)
    End If
  End Sub
End Class

This code allows move a pictureBox with the pressed mouse.
But when I try to inherit the OvalShape, The code does not work, cause the MouseMove event is not generated when the cursor leaves the shape control...

Best regards, Sergiu

Why MouseMove event is different?

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