Flex x-Axis problem

There is a default behaviour for Flex LineChart to set gridline for zero value above the x-Axis (when any of the datapoints are 0 or 1) so that the two of them are distictly visible. Depending upon your case, you might want to show zero values on-top-of x-Aixs rather then at a distance.

The problem arises due to Flex automatically adjusting minimum property of LinearAxis when it finds datapoints close to zero. You may fix this problem by setting minimum to 0 (zero). Alternatively you could try using the padding property to 0 (zero) as well.

Liquid Layout in Flex

Keep in mind while implementing Liquid layout to your Flex application. Try creating a class with static methods that would return widths and heights for UI elements given their default measurements on a default resolution (base resolution).

Also, instead of using the resize event for changing liquid measurements, use ChangeWatcher as described on this link:

http://stackoverflow.com/questions/2119389/flex-problem-with-resizeevent-resize

Changing DataGrid column width in Flex

One interesting find while working with Flex DataGrids is how they behave when you try change column widths at runtime using actionscript: They simple don't show any effect unless you turn horizontalScrollPolicy "off".

More on this at http://junleashed.wordpress.com/2008/07/10/flex-datagridcolumn-width-management/

Flex bug related to Compiled CSS

Recently while playing with .css files in Flex 3, I eventually used the option Compile CSS to SWF and it started giving errors on ClassReference everywhere inside the CSS. Then I found out its a Flex bug (http://bugs.adobe.com/jira/browse/FB-11925) and can be fixed simply by placing the .css files to the application root (though that may mean rearranging things here and there)

Additional information on the bug may be found at:

http://bugs.adobe.com/jira/browse/FB-23440