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// This is an ugly little hack. The effect I wanted was for the text box to
// be the width of the list item, minus the space for the activity type
// graphic. I also wanted the text box to wrap, and to expand vertically if
// more space was needed. To get this to work, the MaxWidth property of the
// box must be set. Unfortunately, due to vagaries in my understanding of
// the WPF layout process, I don't know the "proper" way to do this so that
// it is based on the widths and margins of the controls involved. Hence the
// magic number 48, which is the width of the graphic, plus the margins,
// plus some fiddle-faddle.