After converting to 2.0, my checkbox column is much too wide but I can't figure out how to make this go back to the normal/default small width it usually is.

This is the code I have now:
<SelectionModel>
<ext:CheckboxSelectionModel ID="chkBoxSelect" runat="server" Mode="Single" CheckOnly="true" />
</SelectionModel>

But I've tried it without the Mode and I also tried setting the Width="10px"

But I keep getting this:
Click image for larger version. 

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