Begins a block of flow items
Firefly.Box (in Firefly.Box.dll) Version: debug-master-v:33791
member StartBlock : unit -> unit
All the items added to the flow, until the EndBlock
method is called, will be executed only if the block's condition is met.
Columns that are added between the StartBlock, and the EndBlock
method will only be parked if the block's condition is met