GridViewCheckBoxColumn IValueConverter support seems flawed

[M]

Hello,

We are binding a RadGridView to a property (Observable Collection of Entities) in an MVVM scenario. Within this grid we have a GridViewCheckBoxColumn that has a DataMemberBinding to a string property within our entities. Since the string is always "0" or "1" we use a ValueConverter to convert to Boolean - True/False in order to tick the checkbox. We found that the converter always calls the "Convert" method instead of the "ConvertBack" upon setting the value....

For test purposes we were binding a standard GridViewDataColumn to the same converter to ensure it is working properly which it does....

Example:

    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="0.913*"/>
        </Grid.RowDefinitions>
        <Expander Grid.Row="1"
            Header="Berthing Slots"
            IsExpanded="True"
            VerticalAlignment="Top" Margin="0,4.988,0,0">
            <telerik:RadGridView x:Name="radBerthingSlots"
                AutoGenerateColumns="False"
                IsEnabled="True"
                ItemsSource="{Binding BerthingSlots}"
                SelectedItem="{Binding SelectedBerthingSlot, Mode=TwoWay}"
                AddingNewDataItem="radBerthingSlots_AddingNewDataItem"
                RowEditEnded="radBerthingSlots_RowEditEnded" Deleting="radBerthingSlots_Deleting">

                <telerik:RadGridView.Columns>
                    <telerik:GridViewCheckBoxColumn Header="Available" DataMemberBinding="{Binding Path=HtDiff, Converter={StaticResource HtDiffNumberConverter}, Mode=TwoWay}" />
                    <telerik:GridViewDataColumn Header="HT Diff" DataMemberBinding="{Binding Path=HtDiff, Converter={StaticResource HtDiffNumberConverter}, Mode=TwoWay}" />
                </telerik:RadGridView.Columns>
            </telerik:RadGridView>
    </Grid>

Now, when we change the value in the GridViewDataColumn the "ConvertBack" method is correctly (as expected) invoked....

When we do the same (ticking / unticking the checkbox on the GridViewCheckBoxColumn) it always calls the "Convert" method.....

Clearly that can't be right.... can you guys please help!

Many Thanks in advance.....

Regards

M.

[Tsvyatko]

Hello M,

 We have investigated this problem and it seems that this is issue of the Checkbox Column. We have fixed it and the fix will be available with the next internal build this Friday. Please excuse us for any inconvenience caused.

Thank you for reporting this issue. I have updated your telerik points accordingly.

Kind regards,
Tsvyatko
the Telerik team

[M]

Tsvyatko,

many thanks for that quick solution... we downloaded the internal build and it is working fine now....

Can you give me an update about when we will see it in an official release?!


Many Thanks again

Regards

M.

[Milan]

Hi M,

Our next official release is scheduled for early July which is just a couple of weeks away. 

Greetings,
Milan
the Telerik team

[Marco Barzaghi]

We have downloaded "RadControls_for_Silverlight_3_2010_2_0924_DEV_hotfix". It seems the problem has not be solved. May you help me?

TY in advance,
M.

[Tsvyatko]

Hi Marco Barzaghi,

I have checked this and found that the problem has been resolved in version RadControls_for_Silverlight_4_2010_2_0924_DEV_hotfix but still exists RadControls_for_Silverlight_3_2010_2_0924_DEV_hotfix. If you are unable to use the fixed version I have prepared sample project demonstrating how to workaround this issue using custom column.

Let me know if this works for you.

All the best,
Tsvyatko
the Telerik team

[Marco Barzaghi]

at the moment I've solved using this code

                                <TelGrid:GridViewColumn IsReadOnly="False" Header="My header">
                                    <TelGrid:GridViewColumn.CellTemplate>
                                        <DataTemplate>
                                            <CheckBox IsChecked="{Binding MyYesNoProperty, Mode=TwoWay, Converter={StaticResource YesNoToBool}}"/>
                                        </DataTemplate>
                                    </TelGrid:GridViewColumn.CellTemplate>
                                </TelGrid:GridViewColumn>

I will take a peek to your solution,
TY