How to change TextBox placeholder text color for a specific element, not global

Question

MSDN lists the styles and templates for the TextBox class here. I can override these theme resources by creating a ResourceDictionary in App.

Answer 1

Old question I know, but I found it incredibly fruststrating that I had to create an entire copy of the TextBox style just to edit the placeholder color of one or two TextBox elements.

So I created this method, which can be used on individual TextBoxes as required:

public static void SetPlaceholderColor(TextBox textBox, Color color)
{
    var textBoxContentGrid = VisualTreeHelper.GetChild(textBox, 0) as Grid;
    for (var i = 0; i < VisualTreeHelper.GetChildrenCount(textBoxContentGrid); i++)
    {
        var visualChild = VisualTreeHelper.GetChild(textBoxContentGrid, i);
        if ((string) visualChild.GetValue(FrameworkElement.NameProperty) != "PlaceholderTextContentPresenter") 
            continue;
        var placeHolderContentControl = visualChild as ContentControl;
        if (placeHolderContentControl != null)
            placeHolderContentControl.Foreground = new SolidColorBrush(color);
    }
}

This should also work for PasswordBoxes, since the TextBox parameter should easily be replacable with just "FrameworkElement"