Having an issue with Qt Window Flags

Basically in my custom class (derived from QDialog) when I set any window flags (that I've tried) I can't get see the window. I've used redundant calls to "show()" as this seems to imply, but I still can't see the window. Here is the relevant code:

Code:

---

//synthkeypad.cpp
SynthKeypad::SynthKeypad(QWidget *parent) :
    QDialog(parent),
    ui(new Ui::SynthKeypad)
{
  //initialize ui file
  ui->setupUi(this);
 
  //set the window to modify size
  layout()->setSizeConstraint(QLayout::SetFixedSize);
 
  //initialize connections
  setupConnections();
 
  this->setStyleSheet("QDialog {background-color: rgb(151,111,94);}");
 
//***If this line is commented out, the window works as desired, EXCEPT it has help and close buttons, a title bar, etc..***
  this->setWindowFlags(Qt::CustomizeWindowHint | Qt::WindowStaysOnTopHint);
}

---

Code:

---

void GenrepFE::setupPPMKeypad(SynthKeypad *inpad)
{
  //Just putting this all here so you don't assume this function is screwing things up
  //these are just wrapper functions to initialize parameters of the dialog
  inpad->setSpinBoxRange(-500,500);
  inpad->addType(QString("ppm"));
  inpad->enableNegative();
  inpad->setTextBlob("blah");
}
 
void GenrepFE::openPPMKeypad()
{
  ui->synthButton->releaseMouse(); //don't worry about this ;)
 
  SynthKeypad *ppmKeypad = new SynthKeypad(this);
  setupPPMKeypad(ppmKeypad);
  connect(ppmKeypad,SIGNAL(accepting(double)),this,SLOT(ppmAccepted(double)));
  ppmKeypad->exec();
  ppmKeypad->show(); //this is the "redundant" call I added, even though exec should be showing the window like normal.
 
  delete ppmKeypad;
}

---

If someone could point out why the window flags are leaving the window hidden (or maybe I've used a bad combination?) despite
being show()n, that'd be very helpful. Also, if you can provide an explanation (if it's not painfully obvious) as to why this is happening that's double-plus-helpful :D

Thanks!

dunno. exec() should make it visible.

I decided to have the parent just call "Frameless window" on it. I assume that by using CustomizeWindowHint I was resetting something important?