Infrastructure Controls
WPF Elements provides two components that are used to compose other elements
into larger controls.
WPF DropDownEditBox
The DropDownEditBox control provides a ComboBox-like experience without the
restriction to a specific list of items that the ComboBox imposes. You use
the DropDownEditBox to compose two other components: a compact "edit box" view
and an expanded "selection" view. For example, a colour editor could display
a name or RGB value in its "edit" view, and a colour wheel or sliders in its
"selection" view.
WPF ProportionalStackPanel
The ProportionalStackPanel adds proportional layout functionality, similar
to star-sizing in a Grid, to a StackPanel. This is useful when using the
panel as the ItemsPanelTemplate of an ItemsControl, where you can't use a Grid
because you don't know how many items there will be or how much space needs to
be allocated to each.
