BorderIcons
Type
TBorderIcons
Description
Specifies which icons appear on the title bar of the form.
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.
These values can be combined with the + sign
Example
Form1.BorderIcons:= biSystemMenu + biMinimize;
Form1.BorderIcons:= biSystemMenu + biMaximize;
Form1.BorderIcons:= 0; // allows you to hide all the system window buttons