Drupal 7 Openlayers模块多边形中的动态样式

I am building a site using Openlayers module in drupal 7. In my map page I have prepared my layers using views (OpenLayers Data Overlay) and added a field for the fill color of the polygons (it's a hex value). In my custom style for the layer I added the corresponding value (${field_color_style}) in the fill color text box but I cannot get it work.I keep getting the default black fill color.Is there any other way to achieve this? How can I debug such problem? Anyone else having implemented such fuctionality using drupal 7 and openlayers module? I am building a site using Openlayers module in