I have build a presentation, in which the frame has a function to resize the content.

I have placed the base instructions at _level0, the content at _level1 and the framework at _level2.

The problem I have is, when I resize the content level to 80%, The combobox refuse to follow the user clicks and keep closing back, and even if the user manages to select an option, the change handler didn't perform as it is supposed to.

there is no problem whatsoever if the content level is set back to 100%. Is there anybody can help a desperate guy out?