DataGrid - row selectors missing

Hi,

I have a simple DataGrid:

<DataGrid x:Name="gridEvents" CanUserAddRows="True" 
CanUserDeleteRows="True" AutoGenerateColumns="True" 
HeadersVisibility="All" ItemsSource="{Binding Path=Events}"></DataGrid>

For some mysterious reason the DataGrid row selectors are not shown. I think I tried everything, for example I added the following code to the window OnLoaded event handler:

double w = gridEvents.RowHeaderActualWidth; // w=0
gridEvents.RowHeaderWidth = 10;
w = gridEvents.RowHeaderActualWidth; // w=10

Nothing helps - the row selectors are not displayed.

Has anyone experienced similar behaviour?

Thanks,

Leszek

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