[IE] Advanced property problem with flash dialog

[garry.yao]

Reproducing Procedures

1. Open the 'replace by class' sample page.
2. Open 'Flash' dialog, fill the 'ID' field of advanced tab with 'id1', click 'Ok'.
3. Switch to 'source' and switch back;
4. Open 'Flash' dialog again, switch to advanced tab, check the fields:
   • Actual Result:
     1. The 'id' field is empty;
     2. The 'style' field now has ';';
   • Expected Result:
     1. The 'id' field is 'id1';
     2. The 'style' field is empty;

[garry.yao]

Fixed with [4346].