Custom sitecore command to follow droplink target valye

FollowDropLink.cs

public class FollowDropLink : Command
{
    public override void Execute(CommandContext context)
    {
        var targetId = WebUtil.GetFormValue(context.Parameters["fieldId"]);

        Sitecore.Context.ClientPage.SendMessage(this, "item:load(id=" + targetId + ")");
    }
}