OK. Here is my test sample with latest available build -  12.1.20121.2135. Please take a look on attached sample and video file and if you think that I didn`t reproduce your scenario, feel free to write me and / or modify my sample to reproduce your issue.

Let me know if you have any questions.

Georgi, im using NetAdvantage 2012.1

try this, change the Default Expandable option in design mode

Then when you run, add a button which sets expanded = true

then run and click the button

Hi,

I`m not sure what is your current version, but when I try to reproduce this issue with version 11.1 up to 13.1 everything seems to work properly, so I suppose that you are using very old version. My suggestion is to upgrade your NetAdvantage product

Let me know if you have any questions

Better late than never, here is the problem : it is a bug.

Cause of problem: in designer mode, you set the expanded to FALSE

by doing so, the bug kicks in and disables the expanded property from working

Solution: in designer, set the expanded back to TRUE