CHECK THIS OUT!
Click on screen and watch the windows title bar!!
U will love this demo I think

. Also a bit of comment added.
Cut and paste this code to use instead of the original one.
Code:
#include <iostream.h>
#include <CMUgraphics.h>
#include <string.h>
//These variables are added by Valmont.
char chKeyData;
int ix,iy;
bool bQuit=false;
int main()
{
//****************
// Variables **
int sizebutx = 35;
int counter2 = 0;
int counter = 0;
int sizebuty = 35;
int spacebutx = 17;
int spacebuty = 34;
int buttonx1 = (20+spacebutx);
int buttony1 = (500-spacebuty);
int buttonx2 = (20+spacebutx+sizebutx);
int buttony2 = (500-spacebuty-sizebuty);
//*******************
window testWindow(650,520,0,0);//550 was 500
testWindow.SetPen(RED);
testWindow.SetBrush(BLUE);
testWindow.DrawRectangle(20,20,300,500,FILLED);
testWindow.SetPen(GREEN);
testWindow.SetBrush(RED);
do
{
//Draws Columns
counter2++;
do
{
//Draws Rows
testWindow. DrawRectangle(buttonx1,buttony1,buttonx2,buttony2,FILLED);
buttonx1 = buttonx1+sizebutx+spacebutx;
buttonx2 = buttonx2+sizebutx+spacebutx;
counter++;
}
while (counter < 5);
buttony1 = buttony1-sizebuty-spacebuty;
buttony2 = buttony2-spacebuty-sizebuty;
buttonx1 = (20+spacebutx);
buttonx2 = (20+spacebutx+sizebutx);
counter = 0;
}
while (counter2 < 5);
//By Valmont:
//We start here with the ESC option and mouseclick demo. YOU MUST PRESS
//ESC THEN 2 TIMES LEFT CLICK TO END PROGRAM ENTIRELY!!
// Flush out the input queues before beginning
testWindow.FlushMouseQueue();
testWindow.FlushKeyQueue();
//Few vars to demonstrate co-ordinates in window title.
char chNum[5]; //Make a char for upcomimg int-string conversion.
string szX,szY,szComb;//Use strings to make a pretty output.And ChangeTitle() method demands a string.
//Start loop for esc input until esc is pressed. bool value bQuit will be true then.
do
{
if(testWindow.GetKeyPress(chKeyData) == ESCAPE) //Is the esc key pressed?
{
bQuit=true; //yes, the esc key is pressed.
break;//Get out of loop then. So click twice to end program entirely.
}
testWindow.WaitMouseClick(ix,iy);
itoa(ix,chNum,10); //conversion from int to char. Find more about itoa on the net if u like.
szX=chNum;//auto conversion from char to string. Must do since ChangeTitle needs a string, NOT a char*!
itoa(iy,chNum,10);
szY=chNum;
szComb="Coordinates are: ("+szX+","+szY+")";//Coordinates are: (szX,szY)
testWindow.ChangeTitle(szComb); //Update the current windows title area.
}
while (bQuit==false);
//End by Valmont.
return 0;
}