Compound
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Identifies if changing the width of an existing layer from zero to a positive value will create a rectangular region.
Namespace: Autodesk.Revit.DB
Assembly: RevitAPI (in RevitAPI.dll) Version: 26.0.4.0 (26.0.4.0)

Parameters
- layerIdx Int32
- Index of a layer in the CompoundStructure. The layer index is zero based. It counts from the exterior of wall and from the top of roofs, floors and ceilings.
Return Value
Boolean
This is only allowed if there is a vertical line such that all regions to the left are assigned to layers with index < layerIdx,
and all regions to the right are assigned to layers with index > layerIdx.
