Umbraco 7 error, when trying to render model through partial View

I'm getting the following error when trying to render a form from a custom model in Umbraco 7.

The model item passed into the dictionary is of type 'Umbraco.Web.Models.RenderModel', but this dictionary requires a model item of type 'LeaveRequestStart'.

I'm using the documentation from Umbraco here to generate a form using a model, surface controller and partial view but keep receiving the above error.

here is the Model

public class LeaveRequestStart { 

    [Required]
        public String LeaveStart { get; set; }
        [Required]
        public String LeaveEnd { get; set; }
        [Required]
        public string LeaveType { get; set; }
        [Required]
        public Boolean HalfDayStart { get; set; }
        public Boolean HalfDayEnd { get; set; }



    }

Here is the partial

@model LeaveRequestStart    
    @using UmbracoWithMvc.Controllers

    @using (Html.BeginUmbracoForm("CreateLeave", "LeaveRequestSurface"))
    {
        @Html.EditorFor(x => Model)
        <input type="submit" />
    }

Any help would be greatly appreciated, i have also tried to derive my LeaveRequestStart model from RenderModel but still no love.