poIVectorCtrl SetShellLayer
Sets the current layer.
Note:  This function has been deprecated and only exists for 7.0 backward
          compatibility.
      Syntax
poIVectorCtrl_handle SetShellLayer layer
Application
HyperView Tcl Modify
Description
This command sets the current layer. 
    Note: The storage within HyperView can accept a shell layer or a derived quantity of all shell
          layers (max, min, or extreme).
Inputs
- layer
 - The shell layer label or one of the following derived types: 
- "max"
 - Stores the maximum value of all layers.
 - "min"
 - Stores the minimum value of all layers.
 - "extreme"
 - Stores the maximum absolute value of all layers.
 
 
Errors
Returns 0 if successful, otherwise an error code.