[Mono-bugs] [Bug 334244] New: Form. CheckAcceptButton throws nullref with non-standard button

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https://bugzilla.novell.com/show_bug.cgi?id=334244

           Summary: Form.CheckAcceptButton throws nullref with non-standard
                    button
           Product: Mono: Class Libraries
           Version: 1.2
          Platform: i686
        OS/Version: All
            Status: NEW
          Severity: Normal
          Priority: P5 - None
         Component: Windows.Forms
        AssignedTo: mono-bugs at ximian.com
        ReportedBy: dsuarezv at codice.es
         QAContact: mono-bugs at ximian.com
          Found By: ---


Using a set of non-standard button classes I have found an issue in the
Form.AcceptButton method. Problem is with this piece of code: 

internal override void CheckAcceptButton()
{
    if (accept_button != null) {
        Button a_button = accept_button as Button;

        if (ActiveControl == a_button)
            return;

        if (ActiveControl is Button) {
            a_button.paint_as_acceptbutton = false;
            a_button.Invalidate();
            return;
        } else {
            a_button.paint_as_acceptbutton = true;
            a_button.Invalidate();
        }
    }
}

While accept_button is defined in MSDN as IButtonControl, here it is casted to
Button. The result is that a form with an non-standard Button in the 
acceptbutton property throws a nullref.


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