|2826 - Control  on dialog  extends beyond the boundaries of the dialog  by  pixels|
Windows Installer requires some "funny stuff" to make its dialogs look good. See the "Dialog 2826 bug" section for more details.
You will frequently see this message when examining verbose logs, ignore these "errors" as they are never the cause of what you are investigating. An example:
Action start 8:35:36: PrepareDlg. ... DEBUG: Error 2826: Control BottomLine on dialog PrepareDlg extends beyond the boundaries of the dialog to the right by 5 pixels The installer has encountered an unexpected error installing this package. This may indicate a problem with this package. The error code is 2826. The arguments are: PrepareDlg, BottomLine, to the right