if (XtSelectionCallbackCallback.getAddress() == 0) SWT.error(SWT.ERROR_NO_MORE_CALLBACKS);
ClipboardProxy(Display display) {		this.display = display;	XtConvertSelectionCallback = new Callback(this, "XtConvertSelection", 7); //$NON-NLS-1$	XtLoseSelectionCallback = new Callback(this, "XtLoseSelection", 2); //$NON-NLS-1$	XtSelectionDoneCallback = new Callback(this, "XtSelectionDone", 3); //$NON-NLS-1$	XtSelectionCallbackCallback = new Callback(this, "XtSelectionCallback", 7); //$NON-NLS-1$		int widgetClass = OS.topLevelShellWidgetClass ();	shellHandle = OS.XtAppCreateShell (null, null, widgetClass, display.xDisplay, null, 0);	OS.XtSetMappedWhenManaged (shellHandle, false);	OS.XtRealizeWidget (shellHandle);	int xDisplay = OS.XtDisplay(shellHandle);	atomAtom = OS.XmInternAtom(xDisplay, ATOM, true);	clipboardAtom = OS.XmInternAtom(xDisplay, CLIPBOARD, true);	motifClipboardAtom = OS.XmInternAtom(xDisplay, _MOTIF_CLIPBOARD_TARGETS, true);	primaryAtom = OS.XmInternAtom(xDisplay, PRIMARY, true);	targetsAtom = OS.XmInternAtom(xDisplay, TARGETS, true);}