wpf - ImageSource of Image.Tooltip unreachable - Stack Overflow

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In the code behind I cannot seem to access the Image (or any child) control of a Tooltip of an Image.

Setup: I have a UserControl with an image that on hover displays a tooltip with a larger version of the same source. The control is added to my View using:

<local:GetFrame x:Name="getframe" />

The image is then defined within the usercontrol as follows:

<StackPanel Orientation="Horizontal" x:Name="stkImage">
<TextBlock Text="Latest Image" Margin="0,0,5,0"/>
<Image Name="lastImageThumbnail" Source="/Content/blank.jpg" Height="30" Width="30" ToolTipService.ShowOnDisabled="True">
    <Image.ToolTip>
        <ToolTip Placement="Bottom">
            <ToolTip.Template>
                <ControlTemplate>
                    <StackPanel>
                        <Path Margin="5,0,0,0" Fill="DarkGray" Data="M 0 16 L 16 0 L 32 16 Z"/>
                        <Image Name="lastImage" Height="400" Width="400" Source="/Content/blank.jpg"/>
                    </StackPanel>
                </ControlTemplate>
            </ToolTip.Template>
        </ToolTip>
    </Image.ToolTip>
</Image>

At compile time both Image controls point to a resource of a 'default' image. At runtime after I trigger some action I want to update the Source for both images to a new image, but I cannot seem to access the child Image control. On this action lastImageThumbnail changes to my runtime BitmapImage.

if (File.Exists(fullpath))
{
    var image = new BitmapImage(new Uri(fullpath));
    getframe.lastImageThumbnail.Source = image;
    getframe.lastImage.Source = image;
}

getframe.lastImage.Source has error S1061 'GetFrame' does not contain a definition for 'lastImage.... by giving the control a unique name I believed in WPF I should be able to access it but this does not appear to be the case.

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