[Libvir] Set memory (decrease) from Virt Manager

Hi, I am trying to lower the amount of memory for a Domain using the Virt manager. I am denied from doing this if I want to decrease the memory below 50MB, even though I can do it from virsh. There appears to be a low end limit of 50MB in the Virt Manager. If the current memory allocation is greater than 50MB, I can decrease the amount from Virt Manager, but can't go under 50MB. But if I use virsh, I can decrease the memory to, say, 13000KB and it works. The Virt Manger will show this new amount but will only enable the 'increase' icon in the 'Change Allocation option box. The 'decrease' icon is disabled. Is this a bug in Virt Manager? If not, why can't the memory be decreased below 50MB? Thanks, -Bruce Sun Microsystems Systems Virtualiztion