[Solved] HierarchyExpandButtonStyleSelector is called for every data update in 2010 Q3 SP1, but only called once in 2011 Q1 SP1

[Ron]

I tried upgrading to 2011 Q1 SP1 again today, but was forced to regress again because of a change in functionality.

Here's the situation:

A hierarchial grid, and I want to change the expand button to indicate that there are child elements.  So, I tie into the cellstyle selector using

HierarchyExpandButtonStyleSelector="{StaticResource cellStyleSelector}"

with the following code behind

Public Class MyCellStyleSelector
    Inherits StyleSelector
    Public Overloads Overrides Function SelectStyle(item As Object, container As System.Windows.DependencyObject) As System.Windows.Style

        Dim style As New Style(GetType(GridViewToggleButton))
        Dim backgroundBrush As New LinearGradientBrush()
        Dim foregroundBrush As New SolidColorBrush()
        Dim borderBrush As New LinearGradientBrush()

        backgroundBrush = Application.Current.Resources("GridView_PopulatedToggleButtonBackground")
        foregroundBrush = Application.Current.Resources("GridView_PopulatedToggleButtonForeground")
        borderBrush = Application.Current.Resources("GridView_PopulatedToggleButtonBorder")

        Dim CurrentRowData As BillComponent = TryCast(item, BillComponent)
        If CurrentRowData IsNot Nothing Then
            If CurrentRowData.ReferenceDesignators IsNot Nothing AndAlso CurrentRowData.ReferenceDesignators.Count > 0 Then
                style.Setters.Add(New Setter(GridViewCell.BackgroundProperty, backgroundBrush))
                style.Setters.Add(New Setter(GridViewCell.ForegroundProperty, foregroundBrush))
                style.Setters.Add(New Setter(GridViewCell.BorderBrushProperty, borderBrush))
            End If
        End If

        Return style
    End Function

In 2010 Q3 SP1 this code gets called everytime the underlying data is changed... say I have a function that sorts the rows. 
In 2011 Q1 SP1 this code only gets called when the grid is loaded.

I've even used a .Rebind() with no luck.

[Yordanka]

Hi Ron,

We are currently investigating the problem and will contact you as soon as we have more information.

Kind regards,
Yordanka
the Telerik team

[Ron]

I just tried it in Q2 2011, same problem.  Either the Q3 2010 version should not have called row_loaded everytime the data changed and it was fixed, or it's still broken.

[Milan]

Hi Ron,

We isolated the issue and it have been fixed already. The fix will be available with today's Internal Build.

 

Greetings,
Milan
the Telerik team