procedure TForm1.Panel2MouseDown(Sender: TObject; Button: TMouseButton;
Shift: TShiftState; X, Y: Integer);
begin
ReleaseCapture;
if (x>=0)and(x<=3) then
begin
if (y>=0)and(y<=3) then Panel2.Perform(WM_SysCommand,$F004,0);
// Panel2.Perform(WM_SysCommand,$F004,0)這個什麽意思呢？

if (y>3)and(y<Panel2.Height-3) then Panel2.Perform(WM_SysCommand,$F001,0);
if (y>=Panel2.Height-3)and(y<=Panel2.Height) then Panel2.Perform(WM_SysCommand,$F007,0);
end
else if (x>3)and(x<Panel2.Width-3) then
begin
if (y>=0)and(y<=3) then Panel2.Perform(WM_SysCommand,$F003,0);
if (y>3)and(y<Panel2.Height-3) then Panel2.Perform(WM_SysCommand,$F012,0);
if (y>=Panel2.Height-3)and(y<=Panel2.Width) then Panel2.Perform(WM_SysCommand,$F006,0);
end
else if (x>=Panel2.Width-3)and(x<=Panel2.Width) then
begin
if (y>=0)and(y<=3) then Panel2.Perform(WM_SysCommand,$F005,0);
if (y>3)and(y<Panel2.Height-3) then Panel2.Perform(WM_SysCommand,$F002,0);
if (y>=Panel2.Height-3)and(y<=Panel2.Width) then Panel2.Perform(WM_SysCommand,$F008,0);
end;
end;