PDFsharp & MigraDoc Foundation

Hello everyone,

I have been struggling to figure out how to highlight a textfield. My current code looks like this:

public static void highlightPDF(PdfAcroForm form, string fieldName)
{
PdfAcroField field = form.Fields[fieldName];
PdfTextField txtField;
if ((txtField = field as PdfTextField) != null)
{
txtField.BackColor = PdfSharp.Drawing.XColors.Yellow;
}
}

Nothing happens with this solution however, the variable is showing that it is the color yellow but it doesn't appear that way on my pdf file.

I have tried finding the position of a textfield then drawing a rectangle over it but that solution fell short since it only works for the first element on my pdf for some reason.
Any advice would be greatly appreciated.

If anyone runs into this problem, here is what I did:

PdfTextField txtField = (PdfTextField)field;
PdfArray fieldRect = (PdfArray)txtField.Elements.GetValue(PdfAnnotation.Keys.Rect);
PdfRectangle rect = txtField.Elements.GetRectangle(PdfAnnotation.Keys.Rect);
XRect rectangle = new XRect(rect.X1, rect.Y1, rect.Width, rect.Height);
XRect pdfPosition = gfx.Transformer.WorldToDefaultPage(rectangle);
XBrush backgroundBrush = new XSolidBrush(XColor.FromArgb(64, XColors.Yellow));
XBrush borderBrush = new XSolidBrush(XColor.FromArgb(128, XColors.Yellow));

gfx.DrawRectangle(backgroundBrush, pdfPosition);
gfx.DrawRectangle(borderBrush, pdfPosition);