Transparent widgets are not moving with their parent

[A Former User]

I have created a qt application which brings up a transparent widget.
I have one another already running qt application which brings up a form , this qt application will act as a
parent for my transparent widget.
After changing the parent of my transparent widget, now when I move my parent qt window, my transparent widet(now child of second qt application), is not moving at all with repect to its parent.

NOTE :- If I remove transparency code then my child widget follows its parent and move along with it.
Please help me where I am going wrong in the below mention code.

@
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{

 ui->setupUi(this);

setWindowFlags(Qt::FramelessWindowHint);
setStyleSheet("background:transparent;");
setAttribute(Qt::WA_TranslucentBackground);

this->setGeometry(200,200,500,500);


WId hMSTSCWindow = NULL;

//hMSTSCWindow = FindWindow(TEXT("TSSHELLWND"), NULL);
hMSTSCWindow = FindWindow(TEXT("QWidget"), TEXT("MainParent"));
if(hMSTSCWindow != NULL)
{
    SetParent(this->winId(),hMSTSCWindow );

}

@

[tataeress]

can anyone help please ?
i'm having the exact same problem
except that i wanna move the widgets separately