Command: Ychl

Function: dwg display control and object physical change

Location: 1. POP menu YSup -> Layer Show
          2. Toolbar Y_Quick -> Layer Show

Steps:
  1 ALL - open all layers (used alone, the command is all_lay)

  2 Part - there are two ways of operation: 
      (used alone, the command is show_lay)
     a.  directly select object (can be multiple selection), 
            only show the object belongs to the layer, the other layer closed
     b.  Enter (skip the selected object), just select the layer name, 
            the other layer is closed
            **** working layer is not selected will be closed ****

  3 Add - (used alone, the instruction is add_lay)
    Select your requirements in the list of closed layers 
    and will highlight your selection

  4 Reduc - There are two ways to operate:
    (used alone, the instruction is off_lay)
     a1.  Directly select the object (can be multiple selection), 
           reduce the display object belongs to the layer, the other layer unchanged
     a2.  Enter (skip the selected object), just select the layer name, 
           the other layer unchanged
         **** select the working layer will be closed ****


  5 Lock - lock the layer, to avoid accidentally deleted 
    (used alone, the instruction is lock_lay)

  6 Unlock - unlock the layer (used alone, the instruction is unlock_lay)

  7 New Layer - (used alone, the instruction is new_lay)
 
  8 Physical - Change Layer, LType, Color 
     (used alone, the instruction is chg_lay)
     a1. Select the item, multiple selection, 
          Enter -> Enter Call Layer Menu / <Select Layer Object>:
     a2. Select the layer menu - (accept the menu does not exist layer name)
          select the layer or enter the layer name
     a3. Select the linetype
          A. Unchanged - only change the layer, line type unchanged.
          B. By layer - line type with the layer.
          C. Continuous  - Continuous line.
          D. Center - Center line.
          E. Hidden - Hidden line.
          F. Phantom - Phantom line.

     a4. Select the color - 1 ~ 256
 