SendMessage....Help!

Hello,

The question in this post would probably solve the question in my previous
post.

However, I am quite discouraged with the SendMessage command, because it
really does'nt do what the help files claim, or more obviously would be that
I am most probably missing some notion about its functionality.

Right now, I am stuck with this and I hope someone can help!

The code below is intended to function in the following manner:

Two buttons are in the client area, where after you click on the first one,
it stays down. And when I click on it again, it comes up. Basically the two
buttons retain their state. So if I click on Button#1 and then click on
button#2, they both should appear pressed. However what is happening now, is
that, If I click on button#1 (it now appears pressed) and then I click on
button#2, well, button#1 appears unpressed and button#2 apprears pressed.
Their acting as a set of radio buttons, and this is not what is desired.

If you can please view the code...... Thankyou!
===================================================

LRESULT CALLBACK WndProc(HWND hwnd, UINT message,
                                             WPARAM wParam, LPARAM lParam)
{

static bool SIState[4];
static HWND hdMW_btC3,hdMW_btC4;

switch(message)
{

case WM_CREATE:

//Innitialize array
SIState[0] = false;
SIState[1] = false;
SIState[2] = false;
SIState[3] = false;

//Below: "szMW_btC3_Name" is a string declared eslewhere, not to worry about
it!

//Button#1
hdMW_btC3 = CreateWindow(
TEXT ("button"),szMW_btC3_Name,
WS_CHILD | WS_VISIBLE |BS_PUSHBUTTON ,
10,100,50,50, hwnd,(HMENU)MW_btC3_ID,
(HINSTANCE) GetWindowLong(hwnd,GWL_HINSTANCE),NULL);

//Button#2
hdMW_btC4 = CreateWindow(
TEXT ("button"),szMW_btC4_Name,
WS_CHILD | WS_VISIBLE |BS_PUSHBUTTON ,
10,150,50,50, hwnd,(HMENU)MW_btC4_ID,
(HINSTANCE) GetWindowLong(hwnd,GWL_HINSTANCE),NULL);

return 0;

case WM_COMMAND:

if (LOWORD(wParam) == MW_btC3_ID)
{
if (SIState[0])
{SendMessage((HWND)lParam,BM_SETSTATE,0,0); SIState[0] = false;}
else
{SendMessage((HWND)lParam,BM_SETSTATE,1,0); SIState[0] = true;}
}
if (LOWORD(wParam) == MW_btC4_ID)
{
if (SIState[1])
{SendMessage((HWND)lParam,BM_SETSTATE,0,0);SIState[1] = false;}
else
{SendMessage((HWND)lParam,BM_SETSTATE,1,0);SIState[1] = true;}
}

//other code.....
====================================================

I don't understand why this wouldn't work, It seems very straight forwards.

If I click on Button#1, then the "if" statement in the WM_COMMAND handler
checks to see if LOWORD of wParam (which contains the child ID) equals
"MW_btC3_ID" and then if it does, it gets the state of the button to appear
pushed by sending BM_SETSTATE parameter of the SendMessage function.

If I click on Button#2, then the "if" statement in the WM_COMMAND handler
checks to see if LOWORD of wParam (which contains the child ID) equals
"MW_btC4_ID" and then if it does, it gets the state of the button to appear
pushed by sending BM_SETSTATE parameter of the SendMessage function.

The buttons should retain their state until clicked on again right...

All weekend I have been trying to get this to work.... and I am stuck and
confused about this "SendMessage" and the way it is behaving. I obviously
don't understand it, and the Windows help doesn't say much.... I would really
appreciate any help that can get this program to behave the way desired.

Thanking you all in advance for your gracefull help!

--
Best regards
Robert