query Related to LoadImage function

Hello Friends,

I have developed one ATL com dll for IE tool bar.
My Ie toolbar is having buttons which i have created dynamically.
buttons are having Icon images also.
but i am facing one problem...
I can show only the Icon with "Bit Depth=8" of .ico image.
Actually i want to show Icons with "Bit Depth=32" also.
I am using below code..

UINT colormap = LR_DEFAULTSIZE |LR_LOADMAP3DCOLORS| LR_LOADFROMFILE | LR_CREATEDIBSECTION|LR_LOADTRANSPARENT;

HBITMAP hBitmap =(HBITMAP) ::LoadImage ((HINSTANCE)::GetModuleHandle(NULL),ImagePath,IMAGE_BITMAP,0,0,colormap);

In above code...
while Debugging i came to know that i am getting null in hBitmap variable for Icons with "Bit Depth=32". for Bit Depth=8 it is working fine.

Please suggest me the solution....