public bool CanRender(gView.Framework.Data.IFeatureLayer layer, IMap map)
            {
                if (_renderer == null)
                {
                    return(false);
                }

                return(_renderer.CanRender(layer, map));
            }
        private void MakeTree()
        {
            PlugInManager compManager = new PlugInManager();

            if (_type == RendererType.featureRenderer)
            {
                foreach (XmlNode xmlnode in compManager.GetPluginNodes(Plugins.Type.IFeatureRenderer))
                {
                    IFeatureRenderer renderer = (IFeatureRenderer)compManager.CreateInstance(xmlnode);
                    if (renderer == null || !renderer.CanRender(_layer, null))
                    {
                        continue;
                    }

                    TreeNode parent = null;
                    foreach (TreeNode cat in tvRenderer.Nodes)
                    {
                        if (cat.Text == renderer.Category)
                        {
                            parent = cat;
                            break;
                        }
                    }
                    if (parent == null)
                    {
                        parent = new TreeNode(renderer.Category);
                        tvRenderer.Nodes.Add(parent);
                    }

                    TreeNode rNode = new RendererNode(renderer);
                    parent.Nodes.Add(rNode);
                }
            }
            else if (_type == RendererType.labelRenderer)
            {
                TreeNode parent = new TreeNode("Label Renderers");
                foreach (XmlNode xmlnode in compManager.GetPluginNodes(Plugins.Type.ILabelRenderer))
                {
                    ILabelRenderer renderer = (ILabelRenderer)compManager.CreateInstance(xmlnode);
                    if (renderer == null || !renderer.CanRender(_layer, null))
                    {
                        continue;
                    }

                    parent.Nodes.Add(new LabelRendererNode(renderer));
                }
                tvRenderer.Nodes.Add(parent);
            }

            foreach (TreeNode parent in tvRenderer.Nodes)
            {
                parent.Expand();
            }
        }