isCOBOL Evolve : User Interface : Working With UI and Controls : Creating a control : Destroying a control
Destroying a control
When a control is no longer necessary, it should be destroyed. All the resources used by that control are released.
The syntax of the DESTROY Statement is:
Format 1
DESTROY {screen-name-1      } ... 
        {handle-1           }
        {CONTROL AT location} 
location is defined as follows:
{ screen-loc [CELL  ]
             [CELLS ]
             [PIXEL ]
             [PIXELS]
 
 
  LINE NUMBER line-num [CELL  ]
                       [CELLS ]
                       [PIXEL ]
                       [PIXELS]
 
  {COLUMN  } NUMBER col-num [CELL  ]
  {COL     }                [CELLS ]
  {POSITION}                [PIXEL ]
  {POS     }                [PIXELS]
  
  }
Format 2
DESTROY ALL CONTROLS
Format 3
DESTROY {window-handle }
Destroying every single control may be slow, the best approach is to destroy the whole Screen in which controls are defined. When a graphical window is destroyed, all controls associates to the window are automatically destroyed. The main application Window can't be destroyed.