I have the following code that works well until you move away from the page that holds the values (Home). I've converted the values to be recursive but am struggling to get the @Model.HasValue part to work:

@inherits umbraco.MacroEngines.DynamicNodeContext

@{
    if (@Model.showDonationBox == true)
    {

        double donationCurrent;
        donationCurrent = @Model.HasValue("_donationCurrent") ? @Model._donationCurrent : 1;

        double donationTarget = @Model._donationTarget;
        double progress = Math.Round((donationCurrent / donationTarget) * 100.00, 0);
        var progressWidth = @progress + "%;";
        <div class="widget">
            <h4 class="headng backcolr">@Model._donationTitle</h4>
            <div class="donation">
                <p>@Model._donationText</p>

                <!-- Need to convert this If statement to look up the tree to find the donationCurrent value, and if not found then not show the progressContainer -->
                @if (@Model.HasValue("donationCurrent"))
                {
                    <div id="progressContainer">
                    <div id="progress_bar" class="ui-progress-bar ui-container">
                        <div class="ui-progress" style="width: @progressWidth">
                            <span class="ui-label" style="display:none;">Processing <b class="value">79%</b></span>
                        </div><!-- .ui-progress -->
                    </div><!-- #progress_bar -->
                </div>
                }

                <div class="collection">
                    <h2 class="colr bold">£@Model._donationCurrent</h2>
                    <h4 class="target bold">Target: £@Model._donationTarget</h4>
                </div>
                <h2 class="bold backcolr donbtn">
                    <a href="#">Donate Now</a></h2>
            </div>
        </div>
    }
}

Obviously @Model.HasValue("donationCurrent") works if your on the homepage where the value is stored, but if you move further down the tree, then it stops working.