populating dropdownlist with bendmodes

anyone have any idea how to access photoshops list of blend modes to populate a dropdownlist? Also, if this can't be done, how do you get the blendmode to work? for example I populated the dropdown list with an array of the blend mode names which I typed out. but when I try and combine the name with say var layerNewBlend = BlendMode + '.' + selectionFromDropdown, I get a bad enumeration error. It seems you have to assign the whole blend mode to the variable at one time ei: var layrNewBlend = BlendMode.SCREEN.