Set/Reset a Brush for a PointMark not works

[Lutz]

Hello Team,

we like to give the user the possibility to select and deselect a PointMark in a LineSeriesDefinition.
Simply in the event ItemClick we change the brush of the .Fill property. But surprisingly, if we set the original brush (= nothing in the example), the view don't change.

This is the relevant code:

Private _manualPointMarkFill As Brush

Private _manualSelectedPointMark As PointMark



Private Sub SetPointMarkSelectedState()

    _manualPointMarkFill = _manualSelectedPointMark.Fill

    _manualSelectedPointMark.Fill = New SolidColorBrush(Colors.Black)

End Sub



Private Sub ClearPointMarkSelectedState()

    If _manualSelectedPointMark IsNot Nothing Then

        'The Color of the PointMark do not reset to white, the PointMark remains black.

        _manualSelectedPointMark.Fill = _manualPointMarkFill



        'That works, but is only correct if the PointMark was white before.

        '_manualSelectedPointMark.Fill = Brushes.White

        _manualSelectedPointMark = Nothing

    End If

End Sub

I have made a little example project (*.Zip), but those files are not allowed to attach??

Do you have an explanation for this behaviour and a functioning idea?
Thank you

[Sia]

Hello Lutz,

Can you please send me the sample project through external resource sharing website?

Thank you in advance,
Sia
the Telerik team

[Lutz]

Hi,

you can found the example project here:
https://skydrive.live.com/redir?resid=CDCF1D069074D96C!109

thank you

[Sia]

Hi Lutz,

The problem with your code was that you cannot get the pointmark's fill through the _manualSelectedPointMark.Fill property. What you need to do is to get its child of type path and use its fill as follows:

If _manualSelectedPointMark IsNot Nothing Then
  _manualPointMarkFill = _manualSelectedPointMark.ChildrenOfType(Of System.Windows.Shapes.Path)().FirstOrDefault().Fill
  _manualSelectedPointMark.Fill = New SolidColorBrush(Colors.Black)
End If

I hope that this helps.

Kind regards,
Sia
the Telerik team