Where is the datagrid??? 

Here are the steps to enable the datagrid in Expression Blend. 

If you expand the asset library you will find the datagrid missing.  To get the datagrid in your asset library, follow the steps below:

1) Right click on References and click Add Reference.

2) Browse to Silverlight SDK folder (c:\program files\microsoft sdks\Silverlight\v2.0\Libraries\Client) and select System.Windows.Controls.Data.dll (see image below).

3) Browse Asset library by selecting the arrow keys on the left toolbar.  You will now see the datagrid listed in the controls.  Odd way of adding it but I could not find any other way.  It works fine when building a solution.

Cheers,

Carlos