Bind a class to Property Grid - No setter executed

[Hans Koller]

Hello group,

I design a class to bind it to a property grid for easy modification
of some settings. My problem is now that I want to raise an event when
a settings has been changed.
Thats not a problem with some "normal" properties (see property
DisplayGrid). But when I use a subclass and TypeConverter the setter
of the property is not called.
Set(ByVal value As LineSetting)
m_Limit1 = value
RaiseEvent Limit1Changed(M e, m_Limit1)
End Set
And therefore no event fired.

I already added the attribute
NotifyParentPro pertyAttribute( True)
to the subclass but no change.

Here is my code:

Imports System.Componen tModel
Imports System.Drawing

Public Class Setting
#Region "Private members"

Private m_DisplayGrid As Boolean = True
Private m_Limit1 As New LineSetting(Fal se, Color.AntiqueWh ite)

#End Region

#Region "Events"
Public Event DisplayGridChan ged(ByVal sender As Object, ByVal e As
Boolean)
Public Event Limit1Changed(B yVal sender As Object, ByVal e As
LineSetting)
#End Region
''' <summary>
''' Display grid on Chart
''' </summary>
<CategoryAttrib ute("General"), _
DefaultValueAtt ribute(True), _
DescriptionAttr ibute("Show a grid.")_
Public Property DisplayGrid() As Boolean
Get
Return m_DisplayGrid
End Get
Set(ByVal value As Boolean)
m_DisplayGrid = value
RaiseEvent DisplayGridChan ged(Me, m_DisplayGrid)
End Set
End Property

<CategoryAttrib ute("Limits"), _
Editor(GetType( LineEditor),
GetType(System. Drawing.Design. UITypeEditor)), _
DescriptionAttr ibute("Show Limit 1")_
Public Property Limit1() As LineSetting
Get
Return m_Limit1
End Get
Set(ByVal value As LineSetting)
m_Limit1 = value
RaiseEvent Limit1Changed(M e, m_Limit1)
End Set
End Property

End Class

<TypeConverter( GetType(LineCon verter))_
Public Class LineSetting
Private m_Show As Boolean
Private m_Color As Color

''' <summary>
''' Gets or sets a value indicating whether this <see
cref="LineSetti ng" /is show.
''' </summary>
Public Property Show() As Boolean
Get
Return m_Show
End Get
Set(ByVal value As Boolean)
m_Show = value
End Set
End Property
Public Property Color() As Color
Get
Return m_Color
End Get
Set(ByVal value As Color)
m_Color = value
End Set
End Property

''' <summary>
''' Initializes a new instance of the <see cref="LineSetti ng" />
class.
''' </summary>
Public Sub New()
' set default values
m_Show = False
m_Color = Drawing.Color.A liceBlue
End Sub

''' <summary>
''' Initializes a new instance of the <see cref="LineSetti ng" />
class.
''' </summary>
''' <param name="show">if set to <c>true</c[show].</param>
''' <param name="color">Th e color.</param>
Public Sub New(ByVal show As Boolean, ByVal color As Color)
' set values
m_Show = show
m_Color = color
End Sub
End Class

Friend Class LineConverter
Inherits ExpandableObjec tConverter
Public Overrides Function CanConvertTo(By Val context As
System.Componen tModel.ITypeDes criptorContext, ByVal destinationType As
System.Type) As Boolean
If (destinationTyp e Is GetType(LineSet ting)) Then
Return True
Else
Return MyBase.CanConve rtTo(context, destinationType )
End If
End Function
Public Overrides Function ConvertTo(ByVal context As
System.Componen tModel.ITypeDes criptorContext, ByVal culture As
System.Globaliz ation.CultureIn fo, ByVal value As Object, ByVal
destinationType As System.Type) As Object
If TypeOf value Is LineSetting Then
Dim myLimitSetting As LineSetting = CType(value,
LineSetting)
Return myLimitSetting. Show '
'& "," & myLimitSetting. Color.ToString
Else
Return MyBase.ConvertT o(context, culture, value,
destinationType )
End If
End Function
End Class
Friend Class LineEditor
Inherits System.Drawing. Design.UITypeEd itor
Public Overrides Sub PaintValue(ByVa l e As
System.Drawing. Design.PaintVal ueEventArgs)
Dim myChartLine As LineSetting
Dim fillRegion As New Region(e.Bounds )
' get setting to draw
myChartLine = CType(e.Value, LineSetting)

If myChartLine.Sho w = True Then
Dim myBrush As SolidBrush
myBrush = New SolidBrush(myCh artLine.Color)
e.Graphics.Fill Region(myBrush, fillRegion)
Else
' draw a red cross to indicate false
e.Graphics.Draw Line(Pens.Red, e.Bounds.Left + 1,
e.Bounds.Bottom - 1, e.Bounds.Right - 1, e.Bounds.Top + 1)
End If

End Sub

Public Overrides Function GetPaintValueSu pported(ByVal context As
System.Componen tModel.ITypeDes criptorContext) As Boolean
Return True
End Function
End Class
-------------------------

And this is the code within the form

Public Class Form1
Private OptionsProperty Grid As System.Windows. Forms.PropertyG rid
Private Sub Form1_Load(ByVa l sender As System.Object, ByVal e As
System.EventArg s) Handles MyBase.Load

Dim mySettings As New Setting

AddHandler mySettings.Limi t1Changed, AddressOf Limit1Changed
AddHandler mySettings.Disp layGridChanged, AddressOf
DisplayGridChan ged

OptionsProperty Grid = New PropertyGrid()
OptionsProperty Grid.Size = New Size(310, 500)
OptionsProperty Grid.Dock = DockStyle.Fill
Me.Size = New Size(310, 500)
Me.Controls.Add (OptionsPropert yGrid)
Me.Text = "Options Dialog"
OptionsProperty Grid.SelectedOb ject = mySettings
OptionsProperty Grid.PropertySo rt =
PropertySort.Ca tegorizedAlphab etical
End Sub
Public Sub Limit1Changed(B yVal sender As Object, ByVal e As
LineSetting)
Debug.WriteLine ("Limit 1 changed")
End Sub
Public Sub DisplayGridChan ged(ByVal sender As Object, ByVal e As
Boolean)
Debug.WriteLine ("Display Grid changed")
End Sub
End Class

------------------------

Any help ? Thank you

Greetings,

Hans