254______________________________________________ 4

      

OnDragOver       .
|                    -
  .

OnDragDrop         -
 .    -
    .

I OnEndDrag           

   .  -
      .

OnEnter               |

 ,     -
|                .

OnExit                -
 ,     -
|                 .

    ,     
        .   -
  OnClick.   ,    
, ..     ,    -
  .          -
 .  , :

     , , ,  ,
   .

    ,      
.

    Enter,       -
,   Default.

    Esc,      -
,   Cancel.

         . -
,   Caption    & 
 '' ,      Alt+
  OnClick   .

    true  Checked  RadioButton.

    Checked  CheckBox.

   Click  .

   OnClick ,     
     .

 ,   ,     -
        
,       .  
.                                               \

        
  OnEnter  ,    .  
   -  ,       -
.

    :   -
       .   
     4.1: