Before you can place a cell, you must activate it for the desired method of placement.

• For general Placement with the Place Active Cell tool or the Place Active Cell Matrix tool in the Cells toolbox. This cell is called the Active Cell.
  
  
  
  
  
  
• As a line Terminator with the Place Active Line Terminator tool in the Cells toolbox. This cell is called the Active Line Terminator.
  
  
  
• As a Point cell, for placement with the tools in the Points toolbox. This cell is called the Active Point Cell.
  
  
  
• For Patterning with the Pattern Area tool in the Patterning toolbox. This cell is called the Active Pattern Cell.