text.addListener(SWT.Verify, new Listener() {
			public void handleEvent(Event e) {
				String string = e.text;
				
				char[] chars = new char[string.length()];
				
				string.getChars(0, chars.length, chars, 0);
				
				for (int i = 0; i < chars.length; i++) {
					if (!('0' <= chars[i] && chars[i] <= '9' || chars[i]=='.')) {
						e.doit = false;
						return;
					}
				}
			}
		});