Here’s a Flex tip on changing default flex background colors:
When you are using a different color background to the default one in Flex, there can be a slight delay when resizing the window for the new background color to catch up. Before it catches up, the old default color is displayed. To fix this simply go into your project properties and the into the Flex compiler settings and in the ‘Additional Compiler Arguments’ add the following line:
-default-background-color #COLOR
Swapping COLOR for the code of your color. I would encourage anyone who has Flex tips no matter how obscure to let me know in the comments or by visiting the “write for us” tab in the navigation bar above.