TCustomForm::BorderIcons
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Specifies which icons appear on the title bar of the form.    enum TBorderIcon = { biSystemMenu, biMinimize, biMaximize, biHelp };
typedef Set TBorderIcons;
__property TBorderIcons BorderIcons = {read=FBorderIcons, write=SetBorderIcons, stored=IsForm, default
=7}    Description    Use BorderIcons to get or set the icons that appear on the title bar of the form. BorderIcons can include any of the following TBorderIcons values:    Value        Meaning    biSystemMenu        The form has a Control menu (also known as a System menu).
biMinimize        The form has a Minimize button
biMaximize        The form has a Maximize button
biHelp        If BorderStyle is bsDialog or biMinimize and biMaximize are excluded, a question mark appears in the form's title bar and when clicked, the cursor changes to crHelp; otherwise,no question mark appears.    Note:        Certain combinations of the BorderIcons and BorderStyle properties are mutually exclusive. For example, BorderIcons biMax, biMin with BorderStyle of bsDialog are mutually exclusive.

void __fastcall TForm1::Button1Click(TObject *Sender)
{
  TBorderIcons tempBI = BorderIcons;

  tempBI >> biMaximize;
  BorderIcons = tempBI; //Maximize Button
  
  tempBI >> biMinimize; 
  BorderIcons = tempBI; //Minimize Buttom
  
  tempBI >> biSystemMenu; 
  BorderIcons = tempBI; //system Menu Button    }

   
  Form1->BorderStyle=bsNone;