Ok, I found it. Thank you Marc :-)

Visual FoxPro 9.0 SP1
Partition Property

Specifies whether a Grid control is split into two panels and specifies where the split is relative to the left edge of the grid. Available at design time; read/write at run time.


Grid.Partition[ = nSplit]
Return Value

nSplit
Specifies the position where the grid splits into two panels. If nSplit is 0, the grid isn't split.