Focus issues on Polling Instructions Window finally resolved through use of a Timer.

.../bigbluebutton/modules/polling/managers/PollingManager.as

...uebutton/modules/polling/managers/PollingWindowManager.as

...uebutton/modules/polling/managers/ToolbarButtonManager.as

...rg/bigbluebutton/modules/polling/views/ToolbarButton.mxml