I have tested your resizingAdmin class I found in oodialog 4.2.2.
Works very well when one get used to it, I found 1 strange thing.
Using the attached sample dialog pgm the following is observed.
1.On win xp (oorexx32bit) and win 8 (oorexx 32bit) and screen resolution 1920x1200,
a. start the racfcert.rexx, it should look like attached file 1.First_start.jpg screenshot
b. doubleclick on titlebar to get a fullscreen of dialog, it should look like attached file 2.First_fullscreen.jpg
I have marked with an red arrow where the screen is not redrawn totally, you may have to look close as it's hard to see, but you can hopefully see that the border around the listview is missing at the red arrow and that the dialog color at that point continue into the listview
On the other hand this does not occur on my laptop with screen resolution 1366x768 and win 8 (oorexx 64bit), maybe because the dialog almost fill the screen initially,