Unknown KeyCode :0x0

[topest1]

Hi all,

I have extended JButton to myButton
this is my constructor

myButton(String text,char key){
		this(text);
		this.getInputMap(JComponent.WHEN_IN_FOCUSED_WINDOW).put(KeyStroke.getKeyStroke(Character.toUpperCase(key)),"Action");
		this.getInputMap(JComponent.WHEN_IN_FOCUSED_WINDOW).put(KeyStroke.getKeyStroke(Character.toLowerCase(key)),"Action");
		this.getActionMap().put("Action",action);
		this.setMnemonic((int) Character.toUpperCase(key));
	}

I m using single key shortcut for the myButton
and i am using setToolTipText(String)

But when i hover it shows me like this
"Move Tool Unknown KeyCode: 0x0" (1.png)

And if when i dont set the key shortcut it displays normal
(2.png)

Whats the problem??