Beta 1 to Beta 2 Issue: DataGrid encapsulated in user control and hook to MouseLButtonDown on main page

Hello,

  I have a Datagrid encapsulated inside an user control, in my Beta 1 application I added a hook to the left button down on the main page (I was performing some dragging and dropping operation between to grids).

   Everything worked fine.

   Now I have migrated to Beta 2 and found that the OnLButtonDown only get fired when you click on the header or on a blank area in the DataGrid, if you click on a row it does not propagate the OnLButtonDown to the parent.

   The code that I'm using
private void UserControl_Loaded(object sender, RoutedEventArgs e)
{

  // beTable1 is a user controls that contains ...