Is there a better way to go around getting the initial value of a cell?

Hey Nikolov,

Thank you for your response.  It seems your demo is very similar to my approach - I was able to resolve both my issues with the code I posted last night.  I was wondering if there's a better way to go about getting the initial value of a cell?

Hello Javier,

Thank you for your post.  

I have been looking into it. I am glad that you have managed to resolve your first issue. About your requirement for StringFormat, what I can suggest is to add the string that you want to display before cell`s value directly in your converter. I created a short sample  application based on your scenario to show you how you can implement this. If you are not able to reproduce the issue with the attached sample application, would you please modify it with the functionality, that you are using, so it reproduces the issue. This way I would be able to further investigate this for you and provide you with more detailed information on this matter.  Please let me know if I am missing something about your scenario.

Please let me know if you need any further assistance on the matter.

I got this to work using the following style:

<Setter Property="ToolTip">
<Setter.Value>
<MultiBinding Converter="{StaticResource CellValueHistoryConverter}" StringFormat="Old Value: {0}">
<Binding RelativeSource="{RelativeSource Mode=Self}" Path="Field"/>
<Binding RelativeSource="{RelativeSource Mode=Self}" Path="Record"/>
</MultiBinding>
</Setter.Value>
</Setter>

And the following converter:

public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
{
if (values == null || values.Length != 2) return null;

var field = values[0] as Field;
var record = values[1] as DataRecord;
if (record == null || field == null) return null;

var dataHistory = record.GetDataValueHistory(field);
var lastItem = (dataHistory == null) ? null : dataHistory.Last();
return lastItem == null ? null : lastItem.Value;
}

Is this the suggested way to do this or do I have other options?  By the way, my string format is still not showing up - I had to add it to my converter