We are using Silverlight 4 RC of Telerik. When the user is in a control, such as a textbox, inside a row details expansion, and hits the tab key, the focus shifts out of the details panel and into the grid row.
Unfortunately RadGridView handles key down event when TAB is pressed. The default behavior of the TAB key is to move between cells, which excludes RowDetails panel. With the current version we introduced an option to customize behavior of any key via RadGridView.KeyboardCommandProvider property. I'm attaching a sample project that demonstrates this approach, but in that case you will lose smart TAB navigation support.
We'll try to add built-in support for this case for the upcoming service pack of the 2010 Q1 release.
Greetings,
Ross
the Telerik team
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