ClientToBitmap example for C++ Builder
float BitmapX;
float BitmapY;
BitmapX= x;
BitmapY= y;
LEADRasterView1->ClientToBitmap (BitmapX, BitmapY);
//Change that pixel to White
LEADRasterView1->Raster->set_Pixel (LEADRasterView1->ConvertX, LEADRasterView1->ConvertY, (TColor)RGB(255, 255, 255));