Can't Print LibreOffice Documents in Landscape Format

[Ryker]

I am unable to print my LibreOffice documents that are setup in landscape format (i.e., envelopes). I tried different settings in the CUPS configuration tool (system-config-printer 1.3.2) and in the CUPS Web Interface and they still get printed in portrait format.

My system:
HP Pavilion dv9408ca Notebook PC
1.7 GHz AMD Athlon 64 X2 Dual-Core Mobile Technology TK-53
VectorLinux 7.0 Standard Gold - XFCE
HP Deskjet F4180 Printer

Any help would be appreciated.