I am doing work on project. In which I have developed a full size screen displaying images using XCreateWindow. Now I want to display a dialog on this screen. I have created a QDialog it does'nt show on the full size screen but it is displayed on screen when it is not full size. Any Help. My code for creating screen and dialogbox is as follows

XSetWindowAttributes attribs;
XClassHint *classhints;
XSizeHints *sizehints;
int wndwidth, wndheight;
long input_mask, ic_input_mask;
XEvent xevent;

wndwidth = fullscreen ? WidthOfScreen(screen) : width;
wndheight = fullscreen ? HeightOfScreen(screen) : height;

attribs.background_pixel = BlackPixelOfScreen(screen);

attribs.backing_store = ownbackstore ? NotUseful : Always;

attribs.override_redirect = fullscreen;

wnd = XCreateWindow(display, RootWindowOfScreen(screen), 0, 0, wndwidth,
wndheight, 0, CopyFromParent, InputOutput, CopyFromParent,
CWBackPixel | CWBackingStore | CWOverrideRedirect, &attribs);


XRaiseWindow(display, wnd);

//QDialog I want to show on wnd(XCreateWindow)
ToolbarDialog *objToolbarDialog= new ToolbarDialog();
objToolbarDialog->setVisible(true);
objToolbarDialog->showNormal();