Some issues regarding uploading attachments to wall posts:



1) to upload an attachment the post needs to have some text, else
nothing happens when you press the Post button (btw, the Post button
shouldn't be enabled if you can't post, should get enabled or appear
dynamically when you can post [and maybe show a tooltip that you need to
add some text to post if it's disabled])



2) if you press Post while a big attachment is getting uploaded, it
posts immediately without warning you and you lose the still uploading
item (is not attached in the post). Should use Silverlight Javascript
bridge to talk to the upload control (read some flag from it that
uploads are in progress) and show a warning (have user confirm they want
to cancel any uploads still in progress and post immediately, or wait
and try to post later) if uploads are still in progress