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       # get layers
        provider = listLayers[index].dataProvider() 
        fields = listLayers.fields() 
        listFieldNames = [field.name() for field in fields]
        
        # add fields names to combo box menu_field
        self.dlg.menu_field.addItems(listFieldNames)

def run(self, index):

        """Run method that performs all the real work"""
        # show the dialog
        self.dlg.show()
        
        #clear all combo boxes
        self.dlg.menu_mnt.clear()
        self.dlg.menu_temperature.clear()
        self.dlg.menu_mapuce.clear()
        self.dlg.menu_fraction.clear()
        
        
        #add layers to interface
        mapCanvas = self.iface.mapCanvas() #connect to map canvas
        layers = self.iface.legendInterface().layers() #get layers in project
        rasterList=[] # lists for diffents kinds of layer to use in dialog 
        pointList = []
        polyList = []
        listLayers = []

        for i in range (mapCanvas.layerCount()-1,-1,-1): #for each layer in map canvas 
            layer = layers[i]
            if layer.type() == QgsMapLayer.VectorLayer : #if layer is a vector    
                if layer.wkbType() == QGis.WKBPoint : #if vector is a point layer...
                    pointList.append(layer.name()) #...add it to point list...
                    listLayers.append(layer) #...and to another list to get fields names later
                else :
                    polyList.append(layer.name()) # if vector is line or polygon, add it to polygon list 
                    
            else :
                rasterList.append(layer.name()) #if layer is raster, add it to raster list 
        
        #add layers to combo box depending their types :
        self.dlg.menu_mnt.addItems(rasterList) #add raster to MNT combo box
        self.dlg.menu_temperature.addItems(pointList) #add points to temperature measures combo box 
        self.dlg.menu_vector.addItems(polyList) #add polygon to polygon layer combo box
        self.dlg.menu_fraction.addItems(rasterList) #add raster to land cover box 
        
        # get layers
        provider = listLayers[index].dataProvider() 
        fields = listLayers.fields() 
        listFieldNames = [field.name() for field in fields]
        
        # add fields names to combo box menu_field
        self.dlg.menu_field.addItems(listFieldNames)