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I was contacted by Simon Weaver via Twitter about a problem where the Bindings for MenuItems of a ContextMenu on a DataGrid were acting as though they were associated with a different row than they really were. This seemed pretty weird until Yifung Lin, one of the original DataGrid developers, suggested this might be due to the row recycling behavior DataGrid uses to improve performance. It turns out he was right - but the rabbit hole goes much deeper than that...

Most 3rd party components have a datagrid where you can a drag column header to the area above the grid to group the data. Here is one way to do the same with a regular datagrid.

Data export from DataGrid to Excel is very common task, and it can be solved with different ways, and chosen way depend on kind of app which you are design. If you are developing app for enterprise, and it will be installed on several computes, then you can to advance a claim (system requirements) with which your app will be work for client. Or customer will advance system requirements on which your app should work. In this case you can use COM for export (use infrastructure of Excel or OpenOffice). This approach will give you much more flexibility and give you possibility to use all features of Excel app.

In practice, there often appears a necessity to use a hybrid control joining functionality of the TreeView and DataGrid components, i.e. of the tree representing information by each item in several columns with all abilities characteristic to table view: changing columns by a single mouse movement, sorting upon a click on the column title, editing cell content etc. For example, such control is an essential part of the interface of any mailer: Outlook Express, Windows Mail, Mozilla Thunderbird.

While off reading random blog posts on the tubes, I stumbled upon a post that describes a 101-level scenario of using lookup data in the DataGrid and DataForm with RIA Services.  The author was struggling to find a solution for the problem and was clearly frustrated.

When building a complex data visualization application in Silverlight, I discovered a disturbing issue when dealing with multiple DataGrids on the same screen.  If the ItemsSource of a particular DataGrid gets updated as the result of a SelectedItem change in another DataGrid the child grid would not display any items.  Worse, adding code to query the ItemsSource of the child grid shows that does have a valid and correct ItemsSource, so why doesn’t it display?

The scenario is the classic master-details scenario where perhaps you have a grid of data and when a user selects the row, the details are enabled in a form (or perhaps the child of the element) for editing.

Here Lee demonstrates how to produce a "Summary Row" in DataGrid by customizing the GroupHeader.

SummaryRow in DataGrid is one of the frequently asked request. Here  is one way we can customize the GroupHeader in Datagrid to create one.

I was chatting with a customer last week about how they were using Silverlight for their B2B portal.  They were having some difficulty with showing and hiding the DataGrid component’s Row Detail template programmatically.  I found a WPF-oriented solution to the problem on StackOverflow and adapted it to an Expression Blend Behavior to make the solution more modular and reusable.

I posted the behavior with a sample to the Expression Gallery.  If you try it out, please give it an appropriate rating.