Set Component to Fill Parent or Automatic with Blocks
You can easily set a components height or width to "Automatic" or "Fill Parent" in the Designer, but there is no obvious way to do this with blocks.
All you need to know is this:
Automatic = -1
Fill Parent = -2
Just use those values with a component's Height or Width block to get those settings
Also, resetting default colours for buttons, labels, textboxes:
set backgroundColour to 0 or 1