title: Multiple file extensions in OpenFileDialog
body: <p>How can I use multiple file extensions within one group using <code>OpenFileDialog</code>?
  I have <code>Filter = "BMP|*.bmp|GIF|*.gif|JPG|*.jpg|PNG|*.png|TIFF|*.tiff"</code>
  and I want to create groups so JPG are *.jpg and *.jpeg, TIFF are *.tif and *.tiff and also 'All graphic types'? How can I do that?</p>