Topaz sigplusnet in a report with transparent background

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.NET

I'm using SigPlusNET in a DevExpress winforms report in an XRPictureBox control. it's really not important that it's a DevExpress control but that's what I'm using.

It works completely fine. However, I've got a horizontal line on the report that I would like to show through the signature box so that it looks like the person signed on a line, so that if there's a "j" or "g" or other such letter in a signature it doesn't have to be above the line. If I position the picture box above the line it's all good. But if I overlap them, the box hides the line. I tried setting the sp.BackColor to transparent but it won't accept that. Does anyone know if this is possible with the SigPlusNET object?

Thanks in advance,

AR

What I have tried:

Here's my code:

<pre lang="vb">Dim driverSignatureString As String = Me.GetCurrentColumnValue("DriverSignature").ToString

Dim sp As SigPlusNET = New SigPlusNET
sp.ClearTablet()
sp.SetSigCompressionMode(1)
sp.SetJustifyMode(5) '5 is justify and zoom signature (center of control)
sp.SetJustifyX(12) 'this is really just padding
sp.SetJustifyY(12)
sp.SetImageXSize(300)
sp.SetImageYSize(45)
sp.SetImagePenWidth(5)
sp.SetDisplayWindowRes(True)
sp.SetSigString(driverSignatureString)

Me.xrPicDriverSignature.Image = sp.GetSigImage()