BL-729: Timer.tick error - Cannot access a disposed object
BL-753 Hide unnecessary pdf buttons, show thumbnails
Merge pull request #144 from gmartin7/BL-753PdfControls

BL-753 Hide unnecessary pdf buttons, show thumbnails
Merge pull request #142 from phillip-hopper/BL-729

BL-729: Timer.tick error - Cannot access a disposed object