[gtk+] Update documentation reference screenshots

[Baptiste Mille-Mathias <baptistem src gnome org>]

commit 7d16605667d8d222fe9cf655b5b47be176d0112c
Author: Baptiste Mille-Mathias <baptistem gnome org>
Date:   Tue Mar 6 22:33:39 2012 +0100

    Update documentation reference screenshots

 docs/reference/gtk/images/lock-button.png |  Bin 0 -> 2260 bytes
 1 files changed, 0 insertions(+), 0 deletions(-)
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diff --git a/docs/reference/gtk/images/lock-button.png b/docs/reference/gtk/images/lock-button.png
new file mode 100644
index 0000000..28ce08a
Binary files /dev/null and b/docs/reference/gtk/images/lock-button.png differ