Compile X Window Manager

[Samms]

Oh - no! :) Compilation is OK - but Manager not work. It is only 
overwrite od TinyWM:

import std.c.linux.X11.Xlib;
import std.c.linux.X11.X;

/* gdc ./main.d /usr/include/d2/4.6/std/c/linux/X11/Xlib.d -o 
refuja -lX11 */

int main()
{
	Display *dpy;
	XWindowAttributes attr;
	XButtonEvent start;
	XEvent ev;

	dpy = XOpenDisplay(cast(char*)0);

	if(!dpy)
		return 1;

	XGrabKey(dpy, XKeysymToKeycode(dpy, 
XStringToKeysym(cast(char*)"F1")), KeyMask.Mod1Mask, 
DefaultRootWindow(dpy),  cast(Bool)true, GrabMode.GrabModeAsync, 
GrabMode.GrabModeAsync);
	XGrabButton(dpy, 1, KeyMask.Mod1Mask, DefaultRootWindow(dpy),  
cast(Bool)true, 
EventMask.ButtonPressMask|EventMask.ButtonReleaseMask|EventMask.PointerMotionMask, 
GrabMode.GrabModeAsync, GrabMode.GrabModeAsync, None, None);
	XGrabButton(dpy, 3, KeyMask.Mod1Mask, DefaultRootWindow(dpy), 
cast(Bool)true, 
EventMask.ButtonPressMask|EventMask.ButtonReleaseMask|EventMask.PointerMotionMask, 
GrabMode.GrabModeAsync, GrabMode.GrabModeAsync, None, None);

	start.subwindow = None;
	
	while(true)
	{
		XNextEvent(dpy, &ev);
		
		if(ev.type == EventType.KeyPress && ev.xkey.subwindow != None)
			XRaiseWindow(dpy, ev.xkey.subwindow);
		else if(ev.type == EventType.ButtonPress && 
ev.xbutton.subwindow != None)
		{
			XGetWindowAttributes(dpy, ev.xbutton.subwindow, &attr);
			start = ev.xbutton;
		}
		else if(ev.type == EventType.MotionNotify && start.subwindow != 
None)
		{
			int xdiff = ev.xbutton.x_root - start.x_root,
			ydiff = ev.xbutton.y_root - start.y_root;
			
			XMoveResizeWindow(dpy, start.subwindow,
				attr.x + (start.button==1 ? xdiff : 0),
				attr.y + (start.button==1 ? ydiff : 0),
				Max(1, attr.width + (start.button==3 ? xdiff : 0)),
				Max(1, attr.height + (start.button==3 ? ydiff : 0)));
		}
		else if(ev.type == EventType.ButtonRelease)
			start.subwindow = None;
	}
}

int Max(int a, int b)
{
	return (a > b ? a : b);
}

What is the problem?
Thank you.