Why is my custom property not shown?

Friday, November 06, 2009 7:23 PM

assassin316

I'm building a custom Window and I'm now working on the Titlebar buttons, and have added this property:

Public Shared AllowMinimizeProperty As DependencyProperty

Public Property AllowMinimize() As Boolean
        Get
            Return CBool(GetValue(AllowMinimizeProperty))
        End Get
        Set(ByVal value As Boolean)
            SetValue(AllowMinimizeProperty, value)

            Dim img As Image = GetTemplateChild("imgMinimize")

            If img IsNot Nothing Then
                img.Opacity = IIf(value, 1.0, 0.5)
            End If
        End Set
End Property

Public Sub New()
        AllowMinimizeProperty = DependencyProperty.Register("AllowMinimize", GetType(System.Boolean), GetType(BaseWindow), New UIPropertyMetadata(True))
End Sub

Now whenever I load up Blend, this property does not show up in the Miscellaneous section. If I change this property to NOT be a DependencyProperty, it will show, BUT it simple won't work. The image won't change it's opacity.

What am I doing wrong?

Answers

Saturday, November 07, 2009 2:34 PMGuenter Schwaiger

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Hi assassin316,

because when editing your Window in Blend the constructor of the root element (Window) is not called. Only the constructors of child elements are called. So your property is never registered.

Try it out raise an execption in New() and edit the window in Blend.

Hope it helps.
- Marked As Answer byassassin316 Sunday, November 08, 2009 2:37 PM
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Wednesday, November 11, 2009 6:34 PMGuenter Schwaiger

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Try to register it directly?

Public Shared AllowMinimizeProperty As DependencyProperty = DependencyProperty.Register("AllowMinimize", GetType(System.Boolean), GetType(BaseWindow), New UIPropertyMetadata(True))

Hope that helps.
- Marked As Answer byassassin316 Saturday, November 14, 2009 9:06 PM
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Saturday, November 07, 2009 2:34 PMGuenter Schwaiger

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Hi assassin316,

because when editing your Window in Blend the constructor of the root element (Window) is not called. Only the constructors of child elements are called. So your property is never registered.

Try it out raise an execption in New() and edit the window in Blend.

Hope it helps.
- Marked As Answer byassassin316 Sunday, November 08, 2009 2:37 PM
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Sunday, November 08, 2009 2:37 PMassassin316

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That is an interesting piece of info, thanks Guenter ! :)

Coming back to this problem, how then can I go ahead and have my property show in Blend ???
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Wednesday, November 11, 2009 5:49 PMassassin316

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Sorry, I need to bump this message to find a solution :\
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Wednesday, November 11, 2009 6:34 PMGuenter Schwaiger

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Try to register it directly?

Public Shared AllowMinimizeProperty As DependencyProperty = DependencyProperty.Register("AllowMinimize", GetType(System.Boolean), GetType(BaseWindow), New UIPropertyMetadata(True))

Hope that helps.
- Marked As Answer byassassin316 Saturday, November 14, 2009 9:06 PM
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Wednesday, November 11, 2009 8:23 PMassassin316

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Perfect, i'll try that!

Thanks again!
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Friday, November 13, 2009 6:55 PMD. Matsumoto

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I'm learning about properties as well... just wondering if this solution worked for you? If so, can you please mark it so us newbies know if it worked. :) Thanks!
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Saturday, November 14, 2009 9:06 PMassassin316

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Yes, it worked perfectly :) Just register the property on it's declaration, I've marked the answer above (answered by Guenter).
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