I've created a custom control and I have a FileName property for it.
I've added the EditorAttribute so the little ellipsis button will appear at
design time for the property, which allows the user of the control to
specify a filename.  The code is below and that works great.
But I want to limit the dialog to only show certain file types.  That is, it
should only show files with the file extensions that I specify.  Does
anybody know how to do this?

<EditorAttribute(GetType(System.Windows.Forms.Design.FileNameEditor), _
GetType(System.Drawing.Design.UITypeEditor))> _

Public Property FileName() As String

...