[OpenLayers-Users] StyleMap issue when modifying feature

[PhilM]

I am successfully applying the following StyleMap to a vector layer:

var vectorStyles = new OpenLayers.StyleMap({
	'default' : new OpenLayers.Style({
	     fillColor: "#FF0000"
	    ,fillOpacity: 0.1
	    ,pointRadius: 4
	    ,strokeColor: "#FF0000"
	    ,strokeWidth: 2
	})
	,'select': new OpenLayers.Style({
	     fillColor: "#0000FF"
	    ,fillOpacity: 0.4
	    ,strokeColor: "#0000FF"
	})
	,'temporary': new OpenLayers.Style({
	    fillColor: "#FF0000"
	    ,fillOpacity: 0.1
	    ,strokeColor: "#FF0000"
	    ,strokeWidth: 2
	    ,strokeDashstyle: 'dot'
	    ,pointRadius: 4
	    ,cursor: 'crosshair'
	})
});

However, I wish to change the "default" fillColor and strokeColor based on a
feature attribute, called Colour, as follows:
       'default' : new OpenLayers.Style({
	     fillColor: "${Colour}"
	    ,fillOpacity: 0.1
	    ,pointRadius: 4
	    ,strokeColor: "${Colour}"
	    ,strokeWidth: 2
	})

However, when using attribute replacement, the fill and stroke style
properties of the polygon handles are set to "undefined" in modify mode. I
have attempted to set the extendDefault to false in the StyleMap, and
explicitly set the colours in the "select" intent, but to no avail.

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