Setting number values in dialog.xml doesn't work

Hi,

I'm having trouble setting number values in my dialog.xml files. For example I want to specify the width of a dialog and textfield, but it does not actually work for me. Is there a trick to it?

<playSpeed jcr:primaryType="cq:Widget" fieldDescription="Slideshow speed in milliseconds." fieldLabel="Play Speed" defaultValue="3000" emptyText="3000" value="{Long}3000" name="./playSpeed" incrementValue="{Long}100" minValue="{Long}500" maxValue="{Long}20000" vtype="digits" width="{Long}150" xtype="spinner"> </playSpeed>

I saw/read somewhere that you should specify the type, but that doesn't work for me either. I got all the property names from the Widget API documentation so they should exist...

Any help or information is much appreciated!

Thanks,

Paul