Problem with GWT with a textbox thats only allows a decimal value

Hi all,

im trying to make a validation in java (with GWT) of a textbox thats only have to allows a decimal value (xxx.yy) or a integer value (xx...), but i cant control the point decimal ('.') on the keyCode parameter:

Code Java:

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public void onKeyPress(Widget sender, char keyCode, int modifiers) {
		if (sender == cantidad_txt)
			if (!Character.isDigit(keyCode) && (keyCode != '.') && !(keyCode == KeyboardListener.KEY_DELETE) && !(keyCode == KeyboardListener.KEY_BACKSPACE))
				cantidad_txt.cancelKey();
	}
	}

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(keyCode != '.') fails because after compile y try to write the point on the textbox and i cant write it

So... what's the problem? what im doing wrong?

PD. Srry, bad english ;)