A few UI issues in AST Browser

In AST Browser UI, if I change some parameters like Show Script flag (free form/class form) or Compile Phase and then press Refresh

1) There is no proper progress indicator of the work that is happening in the background in the non-UI threads. The hourglass also appears if I move the mouse on the small area that shows the AST tree. In most of the remaining screen, mouse pointer looks normal. A progress indicator is needed.

2) As soon as the refresh is pressed, the tree and property tables can be cleared as they take time to get populated and decompiled data comes up very fast and they look out-of-sync till the whole work is completed.