Control Sizing and Positioning

Height and Width: If set to NaN, control size comes from HorizontalAlignment & VerticalAlignment properties
Implicit Size & Position

The recommended way to layout an interface.
The sizing and positioning of controls are dictated by their positioning inside of their container.

This works for a single page, non-resizable application, but if the UI Runtime’s window is a different size than the design time window, there may be clipping and visibility issues with controls.
Explicit sizing uses a control’s Height, Width, and Margin properties to position itself relative to its position within the parent container as set by HorizontalAlignment and VerticalAlignment properties.