/// <summary>
 /// Initializes a new instance of <c>FillerEditorDialog</c> using an empty <c>Filler</c>
 /// and positioned beneath the specified control.
 /// </summary>
 /// <param name="c">Control beneath which the dialog should be placed.</param>
 public TabThematicVerticalDialog(Control c) : this(TabVerticalInput.Empty(), c)
 {
 }
 /// <summary>
 /// Initializes a new instance of <c>FillerEditorDialog</c> using an empty <c>Filler</c>
 /// at the default window position.
 /// </summary>
 public TabThematicVerticalDialog() : this(TabVerticalInput.Empty())
 {
 }