Adding method to individually remove item from tier.

git-svn-id: https://svn.code.sf.net/p/genoviz/code/trunk@15066 80d5a9c2-7d8c-4c9f-9369-4e03bca4d2bd
Adding method to individually sym.

git-svn-id: https://svn.code.sf.net/p/genoviz/code/trunk@15067 80d5a9c2-7d8c-4c9f-9369-4e03bca4d2bd
Fixing wrong action while creating new window.

git-svn-id: https://svn.code.sf.net/p/genoviz/code/trunk@15068 80d5a9c2-7d8c-4c9f-9369-4e03bca4d2bd
Merge remote-tracking branch 'upstream'