[Bug 21729] New: missing transparent on VB6 usercontrols

http://bugs.winehq.org/show_bug.cgi?id=21729

Summary: missing transparent on VB6 usercontrols
           Product: Wine
           Version: 1.1.37
          Platform: x86
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: minor
          Priority: P2
         Component: -unknown
        AssignedTo: [e-mail]
        ReportedBy: [e-mail]

Created an attachment (id=26259)
 --> (http://bugs.winehq.org/attachment.cgi?id=26259)
Simple VB6 application with source files

In the VB6 a custom usercontrol can be transparent if MaskColor=BackColor and
the Image is assigned to the MaskPicture.
This seems not supported in wine.

A VB6 simple example is in attachment.