For your example try using a Panel with an image-background and set the Auto-Resize properties as shown in the attached screenshot below. In my example I used a gradient background which is a little different than your example.
Note: When creating a resizable user interface in the Design Center the ONLY top-level resizable components that can be placed directly on the design form are the Navbar, Panel and Toolbar. Panel is the most versatile ui component container and supports vertical scrolling of its components.
See attachment custom-navbar-example.png
Wayne
Genuitec Mobile Team
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