public void show(AbstractAttributesPanel panel) {
		this.panel = panel;
		
		attributeField.setText("");
		valueField.setText("");
		errorLabel.setText(" ");
		
		attributeField.requestFocus();
		
		Rectangle r = Outliner.outliner.getBounds();
		setLocation((int) (r.getCenterX() - getWidth()/2), (int) (r.getCenterY() - getHeight()/2));
		
		super.show();
	}